Am i jealous???? Should i be?

Okay so im 14 yrs old and im a boy. I have this friend named Devin and hes a good friend. Me and him are complete opposites. He has muscles i dont, He gets girls i dont, He has more friends than i do. He likes to show off infront of my sister and i hate it bcuz she makes me feel like ****. Everyone likes devin in my school and most of the school hates me because i am "so called gay" which im not. He told me to go on webcam with him today just so i can see his muscles >_< am i jealous of him? i just hate that im like an outcast. like the ugly duckling??? i dont wanna feel like this. Someone pleaeese help me. Should i change???