Learn Croatian: Sama dezinficiram ranu kad se porežem. - I disinfect the wound myself when I cut myself.

In English, "myself" has two completely different jobs. It shows that you do something alone without help, and it is also a reflexive pronoun used when you are the receiver of your own action. Croatian splits these up. You use sam or sama to mean you do something by yourself, and the reflexive pronoun se when the action happens to you, like accidentally cutting yourself.

How does the word sama show the gender of the speaker?

Sama is the feminine nominative form of the adjective sam (alone/by oneself). Because it describes the hidden subject "I", it tells us the speaker is a woman. A man would say Sam dezinficiram ranu.

Why does the second part of the sentence need se?

The verb porezati se (to cut oneself) is reflexive. If you just said porežem without se, it would sound incomplete, as if you were cutting something else like bread or paper, but forgot to mention what it was. The se shows that you performed the action on your own body.

In the second clause, could the enclitic se go anywhere else?