I met this amazing guy, and him and I fell for each other right away. But when I found out he was 21 I was kind of worried. I'm only 14. I've already read some things similar to this, and I get it, what would he want to do with a child like me. First off, I don't know how old he thinks I am. I look a lot older than fourteen, people usually say 19 or 20. I haven't told him I'm 14 because I'm afraid he'll be disgusted and leave. I really, really like him. We listen to the same music, have the same dark humor, we even have a few mutual friends. He lives about five hours away but distance isn't an issue (Meaning I don't care if I don't get to physically be with him). Just age. So is it legal if we pretty much have no sexual or even physical contact at all?

You need to have permission from your parents to date him.
Now if you two really hit it off right away, a 21 year old man is going to want to see you.
I'm thinking maybe in your 14 year old mind you are seeing more than there is. You don't want to be playing around with someone that age. He needs to know you are a minor and then leave him alone.

Honestly I don't know one 21 year old that doesn't want any physical contact. No offense. Your better off waiting another 4 years until its legal. By that time, you'll most likely find someone WAYYYY hotter.

First you have to tell him you are 14, next your parents has to know he is 21 and give their permission, past that, there will be no issue, he will not date you once he knows you are 14 and any good parent would never allow their daughter to date a 21 year old

You need to be honest with him and tell him you're 14. I'm quite sure he doesn't want to get into any trouble for being with a minor.
Also, like the other posts have said, you need permission from your parents.
Keep in mind, you and him are probably on very different levels of maturity. The younger you are, the more of a difference an age gap makes.