Why is it I feel really wierd around this one girl.

You might want to see a doctor. I think you may have an acute case of the cooties. The good news, it is curable. The bad news, you will probably get it again.

Even you cannot be as stupid as you seem to be in your post. If this is on the up and up, (which I have doubts), then I'm guessing you have a crush on this girl. And she appears to have one on you. So be friendly and do things together and maybe one day you will grow up and discover that the two of you are in love. Or some other girl will come along and the cycle will start all over. But don't rush things and allow time for both of you to grow up.

Or you could be smitten with each other.

Enjoy and things will get better with time.

Wow BTW do I really make myself sound that dumb, I mean I am not the smartest guy around but I don't think I am the dumbest

That may have been a bit harsh on my part, but come on. You tell us about how this one girl makes you feel weird (your words,) then go on to describe what anyone over the age of 12 would recognize as an infatuation (younger ones would call it liking the other person, older ones as having a crush) and yet claim you don't have any clue as to why you get this way around her?

And if I ventured a guess based on the grammar of your original post, you are a bit older than 12. So yeah, my first thought is you are either stupid or simply making something up to see what kind of responses you get from the people on this site, just for the fun of it.

I will however admit that there is a slim chance that you are neither stupid nor making this up, which is why I then gave you a more thoughtful response after my original comment. I am so seldom wrong that I sometimes forget that the possibility exists that I might be wrong. So, just take my advice I gave and you will be ok.