Hmmm...interesting. First of all, let me say that what follows is PURELY my opinion, nothing more. If you don't like my opinion, that's fine. Just ignore it.
I have had a LOT of sex in my life. When I was your age I was a complete slut. And I do mean a COMPLETE slut.
I was with men and women and couldn't get enough of either, although particularly men. I came out just before AIDS and gay society was in the tail end of the wild 70's/early 80's (God I am old!) . I played relatively safely and became more safe as time went on. I have been in a wide variety of situations with a very wide variety of men. Through it all, I have found the following to be true about sex:
1. It's all in YOUR head- And I don't mean that in a negative way.
Sex is really kind of a game. Some of us have 'triggers' that get our imaginations going. Some of us don't. For me, one of my triggers is not about ME enjoying myself, it is about getting somebody else to release their orgasm. It is a game of sorts. When I was with women, I loved performing oral sex, because I loved to drive a woman crazy and give her multiple orgasms using my tongue and fingers. The thrill was NOT about me getting my rocks off. It was about driving my partner to release over and over again. I get the same thrill from causing a guy to lose it. To tease them orally, and then to drive them to the point of absolute abandon. Watching a guy get weak in the knees from the power of his orgasm drives me crazy. But for me, it isn't servitude or submissiveness to give head. For me, if I am being honest, it is empowering to feel like I have such control over their pleasure. Does that make any sense? I mean, giving head is giving head, but where some men would consider it a submissive act, I actually view it as the opposite. For me, that works and is a powerful aphrodisiac.
2. Find your flavor- Sex for me was boring at first, because I didn't really know what I liked. It seems like most media tells us that ANY sex should be enough to drive us all crazy with desire, just because it is "sex". In reality though, sex comes in more flavors than ice cream, and just like ice cream, some of those flavors you will like and others, well, not so much. For me, the whole power dynamic is an intrinsic part of good sex. I can be completely satisfied by a top who knows how I want to be topped and who plays the role in the right way. But I also like to be a top myself and love the feeling of taking charge in bed and directing my partner's orgasm. Some people only truly discover themselves in one role, and that is great. Others, like myself, need the variety. It's all good. But aside from "dominance" in sex, there are a million other "flavors" to try. Some people only get off on a particular color of eyes, hair, or skin. Some guys need a big dick to get them going. More than one guy has gone nuts over my uncircumcised cock because they have a fetish for it. Some guys like hairy, some like smooth. Whatever! The point is, if you haven't found your "flavor", don't give up. Just try something new. If all of your partners to date look a certain way because of some expectation you or friends have, then turn the tables and go for someone you might not normally go for. Try some other flavors!
3. The comfort connection- The last little tidbit I have, is being comfortable with your own body. When I first started fooling around with guys, I was so uncomfortable being naked around them that I couldn't relax... at all! Sex is NEVER good if you aren't relaxed. In my experience, most Mexican-American families are EXTREMELY conservative about nudity. At least, that was the case with myself and all of my friends. That can lead to a lot of insecurity about body image, etc. And trust me, if you are worried about how you look, there is NO way that you will enjoy the moment. Personally, my insecurities were left in the dust once I started going out to clubs
alone and found out that a lot of guys found me attractive. That, along with greater security in my sexual skills, made me more comfortable in my own skin. And that is key to enjoying yourself in bed. If you aren't COMPLETELY relaxed in a sexual situation, you are just not going to enjoy yourself.
Okay...having said all of that, the truth of the matter is that you may not be all that interested in sex. Some guys aren't and that is completely okay. The fact that you are asking the question about it, says that it is at least somewhat of a concern, though. If that is the case, then try some of the things I have listed here. But don't think that you are somehow "abnormal" or anything, and don't listen to anyone who gives you crap about it. Ultimately, you have to find your own way through this. But don't give up on sex until you have allowed yourself to TRY some different things. Most importantly, look for a lover who doesn't just want to get their own rocks off, but one who wants to drive you crazy with desire. Then go from there.
If you have tried as much as you can...or if you have experimented as much as you are willing, and you still feel the same way about sex. So be it. I just hope that you at least try some things before you write it off.
Best of luck!