Hey man this is almost exactly what i went through i am a rather straight appearing guy. I don't know how bad your experience was but mine was not something i would normally do i feel that this trans disrespected me because they said they would bottom after i did it. but then after he/she came which i was so drunk they didnt even want to give me a blowjob but still made sure i came. Chances are you dont have hiv so i wouldnt worry about it. I'll tell you something that the trans i had the sexual experience told me which helped. It was something likelife is about trying new things you cant like everything it doesn't change who you are you just have another experience. I think this was the weirdest thing ive ever done ive told some people about it but i still cant stop thinking about it and how i was taken advantage of. It does get better though your not alone. I wouldn't tell your girlfriend unless you really have to. Theres homosexuals in the army now and it doesn't make you less of a man it just means you've experienced more. If you didn't like it your probably not bisexual i mean unless it was like my experience I promise you suicide is not going to make you feel any better. The thing is we all do weird things and have embarrassing issues. I just found out my brothers girlfriend is an escort i've done it and i have a girlfriend now and plenty of people get a long with me and would never guess. I remember being so worried i had gotten hiv or something.