Ok so I'm a girl and I'm 13 and I really fancy this 21 year old. I know he's not a pedophile because we have spoken and he is well known. I'm not saying this is going anywhere like dating. Maybe when I'm older but I just want to know if it wrong for me to fancy a 21 year old?

Yes, it's wrong. You need to focus on your studies and on sports and on chores at home, not on romance. It messes up your brain cells.

Crushes are normal. 'Fancy' gets over the line. Stay with crushes - at a distance.

I doubt that anyone can really impress upon you that the age difference really means much more than you can possibly imagine.
A 21 year old cannot have normal feelings for a close, one-on-one relationship with a 13 year old. But there's no need to even go into that, because you have not said that it's even happening. I assume that this is all your feelings only?
Let us know if it seems like it might get out of hand.

Feelings are seldom wrong, but what you do about them can be. And pedophiles can be well known and friendly, and you would never know by speaking to them.

Crushes and fancies come and go through out our lives.

Is it wrong for you to fancy a 21 year old? No, it's common for girls to have a crush on guys older than her.

What would be wrong would be if the 21 year old MAN fancied the 13 year old GIRL. That would make him a pedophile. He should not be communicating with you.

How do you know him? Is this the internet? Do your parents know him? Some very "well known" people are pedophiles.

I agree with the poster above it's not wrong for you to have a crush but it is for him. When I was 16 I had the biggest crush on a 21 year old.. and now that I'm actually in my 20s I can see how creepy it would be for anything to have happened. One day you'll look back and shake your head at how crazy it is to think it could ever work, this isn't meant to be offensive but out of experience, because now I can laugh at myself for being head over heels with someone who was wayy out of my reach

If he likes a 13 year old, he is a pedophile, they always seem nice and caring, if they seemed bad, they would not get young girls to fall for them.

But having a crush is one thing, actually having any relationship is wrong

He's 21 yrs old, he has more then holding your hand in his mind.. and it's illegal.
Stay away from him.. it may be exciting to you right now, But you will only end up gettng hurt in more ways then one. Don't get yourself mixed up wth him.. he does not respect you.