Whats wrong with my feelings? readd more please?

so its summer and im 13 year old girl. so obviously i should want to be at the beach with friends and not sitting home all day. well thats what im doing its the third week of summer and ive only gone to the beach once. i feel so antisocial and like i dont wanna be around anyone or talk to people, im even ignoring my bestfriend and the guy i like . am i depressed or is something wrong? i dont feel normal