من همیشه در کتابخانه پشت میز مینشینم و درس میخوانم.

Yes. In Persian, the verb ending already shows the subject, so من is often optional.

• می‌نشینم = I sit / I am sitting
• می‌خوانم = I read / I study

The ending -م tells you the subject is I. So this sentence could also be:

همیشه در کتابخانه پشت میز می‌نشینم و درس می‌خوانم.

Including من adds emphasis or clarity, but it is not required.

همیشه means always.

It is an adverb of frequency, and in Persian these often come near the beginning of the sentence, before the main verb. So:

من همیشه در کتابخانه پشت میز می‌نشینم...

is very natural.

Its position is somewhat flexible, but this placement is common and neutral.

در basically means in, but depending on context it can often be translated as in or at.

So در کتابخانه can mean:

• in the library
• at the library

In this sentence, English would usually say in the library, but the exact translation depends on the full meaning already given to the learner.

In everyday spoken Persian, you may also hear تو کتابخانه instead of در کتابخانه.

• در = more formal/written/standard
• تو = very common in speech

Persian does not use articles the same way English does.

So:

• کتابخانه can mean library, a library, or the library
• میز can mean desk, a desk, or the desk

The exact meaning comes from context.

If needed, Persian can mark indefiniteness with -ی:

• میزی = a desk

But in many ordinary sentences, no article is used at all.

Literally, پشت میز means behind the desk/table.

In context, though, it often corresponds to natural English at a desk or sitting at a desk.

So Persian uses the image of being behind the desk, while English usually says at the desk.

Also, the phrase is pronounced pošt-e miz, even though the short -e sound is not written. That hidden -e is called ezafe.

So:

• Written: پشت میز
• Pronounced: pošt-e miz

Because Persian is generally a subject-object-verb language, unlike English, which is usually subject-verb-object.

So Persian often puts the main verb at the end:

• من ... می‌نشینم
• من ... می‌خوانم

When two verbs are joined with و = and, both commonly stay near the end:

من همیشه در کتابخانه پشت میز می‌نشینم و درس می‌خوانم.

That word order is completely normal in Persian.

می‌ is a very common verbal prefix in Persian. In this kind of sentence, it marks the imperfective form, which is used for things like:

• habitual actions
• repeated actions
• general present-time actions

Because the sentence also has همیشه = always, the meaning is clearly habitual:

• می‌نشینم = I sit / I usually sit
• می‌خوانم = I read / I study

So here the sentence is talking about something the speaker regularly does.

The ending -م marks first person singular, meaning I.

So:

• می‌نشینم = I sit
• می‌خوانم = I read / I study

That is why the subject من can be omitted: the verb already tells you who is doing the action.

Yes, خواندن often means to read, but Persian also uses many noun + verb combinations whose overall meaning is more idiomatic.

درس خواندن is a very common expression meaning:

• to study
• to do schoolwork
• to be studying

So although word-for-word it may look like read lesson, the natural meaning is study.

This is one of those combinations you simply learn as a unit:

• درس خواندن = to study

A learner might expect را because درس looks like an object, but in درس خواندن, the word درس is part of a fixed verbal expression.

So درس خواندن behaves like a compound verb meaning to study, and درس is usually not treated like a separate specific direct object that needs را.

Also, را is most commonly used with definite/specific direct objects, and that is not the idea here.

So:

• درس می‌خوانم = natural
• درس را می‌خوانم would usually suggest something more literal, like I am reading the lesson

A simple pronunciation guide is:

• می‌نشینم = mi-ne-shi-nam
• می‌خوانم = mi-khâ-nam or mi-xâ-nam

A few useful notes:

• In می‌خوانم, the letter خ is the kh sound, like the ch in German Bach or Scottish loch
• The و in خوان is not pronounced like English w here
• خوان is pronounced roughly xân / khân

So می‌خوانم does not sound like mi-khavanam.

The standard modern spelling uses a half-space after می:

• می‌نشینم
• می‌خوانم

This is the preferred written form.

However, many people type informally without the half-space:

• مینشینم
• میخوانم

Both are understood, but می‌نشینم and می‌خوانم are the more correct standard spellings.

It is standard and natural Persian.

A more colloquial spoken version might sound like:

• من همیشه تو کتابخونه پشت میز می‌شینم و درس می‌خونم.

Compared with the original:

• در becomes تو
• کتابخانه becomes کتابخونه
• می‌نشینم becomes می‌شینم
• می‌خوانم becomes می‌خونم

So the original sentence is a good standard form to learn, even though everyday speech may sound more relaxed.