Im upset and need your advice?

Asalaam alaikum, im 21 finished uni for the year and at home and whenever i am home my friends always meet up and we go places together. Last time they asked me to come but i made reasons up like im not allowed coz they were going to a concert and i don't like going to places like that plus i wear a hijab so its not a good look. Anyway they were fine with me from then on and talk to me on facebook. i just read on facebook that they are going out again all of them and they have not asked me they always ask/ invite me, anyway i feel so left out i think its coz i restrict myself to alot of stuff coz i wear a hijaab and try to stay away from haraam stuff and generally disagree with them on stuff. but i feel left out i know they do stuff going concerts n messing around but they good at heart i feel lonely and left out. plz give me some advice. jzk