Am i controling if yes what should i do?

hii im 16 and iv bin with this girl for 5 and a half months .... i keep hearing im controling ... i worry about her all the time ... i dont let her talk to guys well certain guys who try to get with her or hit on her all the time .... i can only see her on weekends because of school than when the weekends come her friend will ask her to hang out and she will drop are plans to hang out with her friend and for the record she is moving away in july so i get mad and angry because we dont have much time together ..i hate it when she goes out without me like when she goes out with her friends who drink or do drugs because i do nether and i get upset when she does .... i get really worried and upset when she dosnt call or when she dosnt pick up ... am i controlling if i am please give me some advice i dont wanna loose her