Hello and welcome.
I can kinda understand what you mean by being scared. I was incredibly confused and upset when I was first diagnosed at 18. But it isn't anything to be afraid of. You're just different, sort of like you're a Mac in a world of PCs, or vice versa. I would encourage you to get tested as well, if for no other reason than having that piece of paper with a clinical diagnosis can be useful when you need some accommodations.
As for emotions, you might have alexithymia, it a condition where a person had difficulty recognizing not only their own emotions, but the emotions of others as well. There appears to be a high overlap between autism and alexithymia.
And your special interests can turn into a superpower. I work in a library and have since I was 17 (I'm now 31), and I have incidentally memorized the dewey decimal system, which is super useful whenever the catalog goes down, and in a lot of cases I'm way faster than someone searching the catalog, and I'm also able to tell when a book has been miscataloged under the wrong number.
And if you're still feeling upset about possibly having autism, this is something I tell a lot of people, Satoshi Tajiri, the creator of pokemon, is on the spectrum.
I do think you should discuss this with your parents. My parents were always supportive of me, even before the diagnosis, and even more so after. I know that I had always had a pervasive feeling of somehow not fitting in, like everyone got a decoder ring in their cereal box but me, and not I can't 'decode' the secret language everyone is speaking, even though they expect me to.
A formal diagnosis can also help with treatment, although currently the only treatment covered by insurance is ABA therapy (which does not have a good reputation in the autistic community) but you might need a different sort of therapy. I do CBT (cognitive behavioral therapy) with a therapist that specializes in working with people with developmental disabilities.
Best of luck, and know that here you're among people who will understand.