Если я снова окажусь неправа, я сразу скажу об этом, чтобы тебе не было обидно.

That is a very common question.

In Russian, when you are talking about a real possible future condition, the verb after если is normally in the future, not the present.

So Russian says:

• Если я снова окажусь неправа...
• literally: If I turn out to be wrong again...

This is normal Russian grammar. English and Russian behave differently here:

• English: If I am wrong again, I’ll say so
• Russian: Если я снова окажусь неправа, я сразу скажу...

So even though English uses a present form after if, Russian usually uses a future form for future situations.

Окажусь is the 1st person singular future of оказаться.

In this sentence, оказаться means something like:

• to turn out to be
• to end up being
• to prove to be

So я снова окажусь неправа means not just I will be wrong again, but more specifically:

• I will turn out to be wrong again
• it will turn out that I’m wrong again

There is a slight nuance of discovery/result. It suggests that the speaker may not know yet, but if it turns out that she is wrong, she will admit it.

Because неправа is the short form of the adjective неправый / неправая, used in the meaning wrong / not right.

In Russian, this short form is very common when talking about whether someone is right or wrong:

• Я прав. = I am right.
• Я не прав. = I am wrong.
• Я права. = I am right.
• Я не права. = I am wrong.

Here the speaker is feminine, so the form is неправа.

Compare:

• masculine: неправ
• feminine: неправа
• plural: неправы

Неправильный / неправильная usually means incorrect, wrong in a more objective sense, often about answers, methods, forms, etc.:

• неправильный ответ = an incorrect answer

But when talking about a person being wrong in an argument, judgment, or opinion, Russian typically uses прав / неправ.

Yes, that is possible, but the nuance is a little different.

• Если я снова буду неправа = If I am wrong again
• Если я снова окажусь неправа = If I turn out to be wrong again

So:

• буду неправа is more neutral and direct
• окажусь неправа emphasizes the outcome or realization

In this sentence, окажусь sounds natural because the speaker is talking about a future situation where the truth may become clear.

Скажу is the future of the perfective verb сказать.

Russian often uses the perfective here because the speaker means one complete action:

• I’ll say it right away
• I’ll immediately tell you / admit it

This is not about an ongoing process of speaking. It is a single, definite act. That is why perfective скажу fits well.

Also, сразу strongly supports that idea of one prompt, completed action:

• я сразу скажу = I’ll say it immediately

Because сказать это and сказать об этом are similar, but not identical.

• сказать это = say that, say those exact words or that exact thing
• сказать об этом = say something about it, mention it, speak about it

In this sentence, об этом refers back to the fact that the speaker was wrong. So the meaning is closer to:

• I’ll say so
• I’ll say something about it
• I’ll admit it

Using об этом makes it sound like the speaker will openly mention the matter.

Because о changes form to об before certain words for easier pronunciation.

So Russian says:

• об этом
• обо мне in some contexts
• but usually о тебе, о друге, etc.

You do not say о этом in standard Russian. The correct form is об этом.

Because чтобы introduces a clause of purpose:

• so that
• in order that

So the speaker is saying:

• I’ll say it right away so that you won’t feel hurt
• ...so that it won’t be hurtful to you

After чтобы, Russian very often uses a form that looks like the past tense:

• чтобы тебе не было обидно

This does not mean past time here. It is part of a construction used for purpose, desire, or a hypothetical result. Historically, чтобы contains бы, which is why this pattern appears.

So the important thing is to recognize the whole structure:

• чтобы + past-form verb
  often expresses something like
• so that ... would ...
• in order for ... to ...

Because обидно and обидеться are not the same.

Обидно is a predicative word meaning something like:

• hurtful
• painful emotionally
• offensive
• I feel hurt

And it often goes with a person in the dative case:

• мне обидно = I feel hurt / It hurts me
• тебе обидно = you feel hurt

So:

• чтобы тебе не было обидно = so that you wouldn’t feel hurt / so it wouldn’t be hurtful to you

By contrast:

• ты обиделся / ты обиделась means you got offended / took offense

That is a more event-like verb. The sentence with обидно focuses on the emotional state, not on the act of becoming offended.

Because обидно works in an impersonal construction.

Russian often expresses feelings this way:

• мне холодно = I am cold
• ему скучно = he is bored
• ей грустно = she is sad
• тебе обидно = you feel hurt

The person experiencing the feeling is in the dative:

• мне
• тебе
• ему
• ей

So тебе here means to you / for you, but in natural English we usually just translate it as you:

• чтобы тебе не было обидно = so that you wouldn’t feel hurt

There are two commas because the sentence contains two subordinate clauses.

1. Если я снова окажусь неправа, ...
   The clause with если is a conditional clause, so it is separated by a comma.

2. ..., чтобы тебе не было обидно.
   The clause with чтобы is a purpose clause, so it is also separated by a comma.

So the structure is:

• Если... , main clause, чтобы...

That punctuation is standard in Russian.