I really messed up

There was this one guy that I thought was very cute.

He's 18.

We went fishing yesterday and I told him what I thought.

That was my first time hanging out with him.

He was attracted to me very quick.

When I was taken home by his mother.

In the back seat of the truck he put his arm around my leg and made a move on me.

Then he said, "You smell good." (Which I thought was really perverted.)

And he kissed me.

Then he wanted to come over to my house and hangout when my mom wasn't there and I told him "no".

I told my mom and she was excited for me.

But now I'm not attracted to him, he just seems perverted and not good looking to me anymore.

I just want to be his friend.

I'm not sure you messed up, but you probably need to be clear with him about your feelings. This can be hard. But if you aren't into him then that's just the way it is. Sometimes feelings change, often actually...

I don't think you did anything wrong either. Seems like he was getting the WRONG idea, and pretty quick too! Since he wanted to come over when your MOM wasn't there, it's pretty clear what he had in mind.

You did the right thing. And I can see why you're not attracted to him now. He came onto you too fast, and he seems like a creep to you now -- he would give me that impression too. You did the right thing! Good girl!

Okay... I read it but I'm confused on some of the points.
What did you tell him?
For future reference...that is a compliment usually. Could have been false flattery in this case but it is not perverted by any means.
What was she excited about?
If you think he is perverted then I don't understand why you want to be his friend.
I'm still not clear on why you wanted this guy's attention. I know you found him attractive but I'm not sure what you thought was going to happen. I don't know how the decision was made to have his mother along as chaperone but I'm glad that she was there. 18yo guys do not usually have there mom along on dates. And on that line, he is 18...you are 15. 18yo guys should not be hitting on 15yo girls.
I hope you understand I'm asking these questions because we are friends and I want you to consider what happened here carefully for future reference for your safety and well-being.

I agree with Leed very often and this is no exception.

I hate to say it but it sounds like a typical 18 year old boy with sex on the brain. He's moving fast and you're not into him now. That's not messing up, that's smart!

Good for you I say! Liking a guy isn't an invitation to sex and that's not a good sign that he immediately went there. I think you made the right choice. Don't let some guy pressure you into anything you don't want to do, too fast or too soon. Whether you liked him or not, a guy should have more respect for you than that. The fact that he is asking to come over when your mom isn't home is creepy enough as it is.

On to better things, girl!