What do you do and how do u react when your friends reinforce the idea to you that being "straight" is better

If they are saying these things to you, it probably means they do not entirely accept you and want to change you. Try telling them that this is who you are and you can't control your uality. Ask them if they would stop because it makes you very uncomfortable. Once they know, they might stop. But if they don't, then hang with other people because any friend who is trying to change you from yourself is not a true friend.