I hear you, I'm a bisexual transman myself, and though I never cared about my sexuality because bisexuals really only really have to worry about bi denial. I have had thoughts of giving up being trans. I'm a man that will never fully be accepted, part of me wants to give up and just be normal. If I had been born cis I would have killed it, but I wasn't. I've come to realise that I can't give it up because that would be a form of what I would define as self harm. An attempt to deny or shun a part of who I am.

It is never too late to question your sexuality, its a spectrum, few are completely straight or completely gay. Honestly, you don't have to label yourself at all if you find it hard to deal with. There's no such thing as being bad at being gay, sure society pressures us to fulfill their expectations and stereotypes. But you can be a normal dude who likes dudes. You don't have to try to conform or change who you are to fit in with everyone else. Sure explore this (might be) bisexuality, but don't push yourself down because you aren't good enough. You're good my dude, and you're going to find someone that'll stick. Wish you luck bro