How Do People Become Homosexual?

Some doctors say it is because of their surroundings....some doctors say it is because of being molested/like the stockholm syndrome..some doctors say they are experimenting....some doctors say they are born that way....some doctors say they are brainwashed by their gay mother or father....some psychologists say they are looking for what they feel they missed from their real parents/love/protection/relationship...you decide...

To say that it is in born, the way some suggest, would be to say that a person cannot change. Which is clearly not the case. Many gays have become straight.
How they got that way to begin with, I don't know. There must be something wrong somewhere.

The majority are born that way and cannot be changed but there are a few that do, for one reason or another, become homosexual.  The reasons are many and well said in an earlier answer by nomad ;)