Would you know if your autistic?

I've wondered about it myself and think I'm somewhere on the spectrum...I like to watch things spin in a circle, had to be forced to socialize when i was young,had a string of phobias that I had to overcome and prefer doing things by myself most of the time...I also see patterns in things that other people miss. You could go online and do a self-check from a list but the thing is if you are functioning and doing well then there's no reason to label yourself or worry about it.