I'm really confused about my sexuality! Help?

Okay so here's the deal.

I've always been attracted to boys, ever since I was young.

In grade 11 a bunch of girls at my school told me that there was a rumour that I was a lesbian and that just sparked this obsessive train of thought in my head. Slowly, I began to question and obsess over my sexuality. Every time I told myself that I wasn't interested in women, something would come up. For example: I don't like to kiss girls, but then I would try to imagine it. It used to be something that didn't interest me, but the more I questioned it the more I accepted it.

Now it's gotten out of hand. I'm always so stressed out about it. I have a boyfriend who I love very much, but now the thoughts are back. It's gotten to a point where asked myself if I was still attracted to boys and now I question myself even when I'm with him. Even though, two months ago I was head over heals! (We've been dating for 1 year and a half now)

I can't focus on anything. I'm always depressed and I don't know who to talk to, because I feel like I'm caught in between to worlds. I WANT to spend the rest of my life with a man, but I'm afraid that I'll never shake these questions. I'm afraid to experiment, because I don't want to leave my boyfriend. I don't want to tell anyone because I'm so unsure of myself. I feel like i"ve convinced myself that I'm bisexual or a lesbian by asking myself all of these questions all the time. I know that I should just enjoy life, and follow my heart, but this causes me too much anxiety and I want to know if anyone has had a similar experience and how they have learned to deal with it.

Basically, its been four years since I first began questioning and I just want answers, or people to relate to I guess.

16 hours ago - 3 days left to answer.

Additional Details

Im often able to get over my anxiety on my own, but a lot of my friends(slash people I know) are now coming out and this always brings back all the anxious feelings.Things that remind me of it just make me really stressed. Could I maybe have an anxiety disorder? I often feel like there's a voice inside my head, telling me really negative things, like everyone hates you and that I'll never get through my anxiety. It's like there's a constant internal struggle, between two people me post rumours (which is not someone I like) and me pre rumours. I used to know who I was, you know? And now everything seems mixed up. Maybe I should go see a therapist, because I also have these kinds of worries about my school and future jobs.

Thanks for all the answers so far!

16 hours ago

oh and one more thing, I rarely want to get out of bed and go to school, because I find that there are no good looking boys at school so I find myself looking at girls instead… And that causes anxiety. I avoid making friends because I'm worried I'll develop feelings for them. How insane is that? And I totally know there's nothing wrong with being bi or gay, but I just don't want that for myself. A lot of my friends are and I love em, but I don't see myself being gay or bi.

16 hours ago

AND one last thing, I don't find all the guys as attractive sexually anymore as I used to. My libido when it comes to guys is pretty much gone. I mean I still love sex with my boyfriend, but I don't get as excited about hot movie stars anymore.