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AroAce here! I didn't ever really think I was heterosexual, but I went through labels like bisexual and lesbian and they never really fit me, because I never really experienced romantic or sexual attraction for anyone at all.

It is definitely possible that you're on the ace spectrum. You don't have to be sex repulsed to be asexual. While I'm sex positive, I'd never have sex myself. Other people who are asexual do have sex sometimes. For example, would you say that you only experience sexual attraction to people after building an emotional bond with them, such as is the case with your boyfriend? If that's the case, demisexual may fit you. Or, you may be grey. Don't get too hung up on the labels, though! You can just say you're on the ace spectrum if this is something you're comfortable with. You don't have to fit yourself into a box for anyone, just do you!

Try not to stress too much and instead try to enjoy the process of figuring out what you are comfortable with as far as labels, what you like and dislike, etc. Like Jenna said, this isn't a process that happens overnight, so you deserve to enjoy your time figuring things out.

Remember that if you do decide to have sex with your boyfriend to let him know if you ever do get uncomfortable, and don't be afraid to ask him to stop if you're not. It's okay to say no, and it's important that you don't push yourself into doing things that you may regret later.

Talking to your sibling sounds like a wonderful idea! You seem very supportive of them so they may be willing to share some of their experience with you and answer some of your questions. It's always great to have someone you can relate with in your life, and your sibling seems like they could be that person.