How do you know?

You don't have to justify your sexual preference. Your answers were right-- and were honestly what I was thinking before I got to that part, verbatim. They can't comprehend your being gay, so they feel the need to ask you why. They want some closure, and that's all you can give them.

 

There is nothing to know. You are what you are. That's like asking, how do you know you're right handed? Because I right with my right hand. How do you know you are attracted to other girls? Because I'm attracted to other girls. lol not too complicated

 

Yeah Dhamma, but how do you know that?

I've been struggling with this too OP, though perhaps for different reasons.

While it's easy to say "I'm 6 foot tall. I know it. People see it, I see it when I stand up against a height chart." it's more difficult to have similar certainty about something that no-one can see, and that you might only have just recognised in yourself.

Of course it's not complicated for you Dhamma, you're not doubting those things. But It would seem the the OP is doubting some of the things that she's learning about herself.

I guess this post is more a question really than an answer, but I agree with the OP. How does one know anything about oneself? Do we all have to wait until that magical morning when we wake up and just feel like we're a bisexual, anarchist, given the holy duty of Lord Nelson's ghost to fight against the evil oppression of carpet salesmen?

Or is there a way to systematically validate what you think you might know?

 

Next time, ask them how they know they're straight, and they'll probably say, "duh, it's because I like the opposite sex". Then ask them what they think led you to believe that you're gay.

Just like it is with science, one can never be 100% positive about anything. Most, if not all, of us will have some lingering doubts, but even so, if 95% of the observations point to "gay", then it's pretty safe to say that you are. Whatever the case may be, you're always 100% yourself, and no one can put a label on that.

 

I know because when I look at guys, something in my brain goes "oh he's attractive". I don't get that feeling when looking at girls. I've found plenty of girls cute, but not in a sexual way. Never the feeling that I want to have sex with them or am interested in what's under their clothes.

 

Answer: Because if you were in my mind, seeing through my eyes, you would just KNOW too. It would be obvious.

That would be the quick, easy answer.
More deeply though, and I'm going to talk just about my personal experience, I've learned that keeping an open mind resolves a whole lot of bugging recurring questions. It's completely closing the door to other possibilities that makes an issue.
What I mean is:

I've been straight as long as I could remember. It was that obvious to me: I was so attracted by women and so repelled by men that the question didn't need asked. Yet, being transgendered, I was very close to gay communities at some point that this Are you sure? thing bugged me too, to some level (even if my answer came rather quick it's inside I was bothered). I had to wonder what made me straight like that? And what exactly is a woman, what exactly is a man, where is the limit where I become completely turned off by a person even though I love their personality? It's rather complicated.
I then found this answer: 99,9% of the people I can be attracted to are women because of some features they have that are completely feminine.
By opening the door even a tiny bit to other possibilities (I can be attracted by SOME men even though it's not probable, if circumstances are right) it freed me of that problem. I don't feel like I have to verify I fit in the Straight mold anymore.

However, how you feel and what you tell to people don't have to be the same thing Though if you're a bit like me, if how you feel is solved, your problem will be solved too no matter what you tell people.