I am confused about something?!help?

this girl on my team for sports just doesnt like me and kinda ignores me tho we hang wit the same people. like u kinda have to go out of ur way to snub somebody sooo much. idk y because i never did anything to her. its starting to get on my nerves. any idea on why that is. then this one time i asked if they(our group of friends) ever had joint pains n she flat out said i was out of shape. y so arrogant n snobbish, cuz im getiing irritated :( . thanks !