<human>: Can you condense the text into a few key points?

First of all, i don't have any kind of problems with gay people.

I'm a 20yo male. In general i'm a funny person, last week me and some friends were talking during lunch and when the subject "Gay marriage, etc." came, some of them pointed out that if they didn't knew me well enough, they would probably tell that i was guy, because of the way i act, and sometimes, dress. 

I'm straight, and I don't want girls to say "Oh, i thought that you were gay" while I'm hitting on them (never happened to me, saw this on movies)
<bot>: Some friends told me I look gay and I don't want to be that way, need ideas to look manlier.