I think I'm asexual, but I'm not sure. Is there anyway to verify it?

If you don't feel sexual attraction, that's enough for you to determine who you are. Some people wrongly believe that you should always experiment before determining your orientation, to see if you do or do not like something. But orientations are not about experience, they're about feelings. Your identity is nothing more than what you feel you are. So if you believe you're asexual because you don't feel sexual attraction, that's who you are, you don't need to do anything to prove or confirm it.

Asexual means not being sexually attracted by any gender. So to verify it. Is to ask yourself if you have an impulse to have sex. Do you want to sleep with someone some day. And of course, some asexuals do sleep with their partner to satisfy that person. But not everyone that's asexual do that. So, try to figure out if you're sexually attracted to people. Personally, i'm grayace. Or grayasexual. I sometimes feel some sexual attraction for females and only females. But that doesn't happened often. So being grayace means SOMETIMES, not often at all. Experience some sexual attraction for someone.