so this is pretty complicated, i think accepting the way you are it's a matter of time, it really is okay to wish you were allo because of how deeply rooted amatonormativity is in our society and brains, but you'll also have to accept eventually that this is who you are and wanting things to be different it's not gonna change that, it doesn't matter how much time this takes you since it's easier said than done. i think knowing that there's absolutely nothing wrong with you, and having people relate to what you're feeling can help, even if it's hard to grasp at first. i totally get what you're feeling because i feel the same, so know that you're not alone in this.
about coming out as aro, personally, i wouldn't recommend it, even less if you're having a hard time accepting your identity, because having someone question it or not accepting it can make it harder process yk? ofc i understand the need to let someone know what you're feeling but sometimes it's better to not really explain things like that to someone that won't get it, it's just exhausting, still, it's your decision, if u still decide to do it i wish you all the luck and that you find someone that understands how you feel and that accepts you just as you are, just remember that you don't owe anyone explanations of what you feel and that no one has the right to minimize this feelings. :)