Is it usual and normal that my friends make me feel TOO sure?is it bad?

last summer I made friends.very very good friends.i could say the best friends i could ever make.I m very grateful!but now i dont see them cause they live elsewhere and they have a lot 2do.but now in school or out of school i am not interested in making other,new friends cause i think of my "summer-friends" and i feel that they are more than enough and i dont need others.So in school many times i wanna be alone and i dont feel my clmates as my friends although i know them much longer and i always saw them as friends.i feel that i dont need them and when they talk 2me they are geting on my nerves.all except my best friend.if sb hurts me or swears on me i just think of my "summerfriends" and i start laughing cause they make me feel more than sure about myself.and without exaggeration i think of them every but EVERY day.although i see them very seldom.but we talk very much (telephone) and they are ALWAYS there and help me if i have a problem(and i miss them) is it normal?