People says that Taylor copied this song for "You belong with me", do you agree?

There are similarities, but the whole 'she's the cheerleader and gets everything I wish I had' thing has been around LONG before Saving Jane made that song.

I have to admit, it does seem really similar, especially the part 'she is the prom queen, i'm in the marching band, she is a cheerleader, i'm sitting in the stands'

It's preety similar,but I don't think Taylor copied it.She's too matture like to doing that.

No, not really. Taylor writes all of her own songs... With a little help from Liz Rose and some others whose names I can't remember. xD