Running away or just trying to be alone?

Lately when I go to youth or church service , I can't concentrate during the service at all..... I don't know why but I just can't concentrate ...... It's like when I sit there , my mind just wanders away.... Then when I go out side and sit , I start thinking about a lot of things ...... So yeah...... If i disappear during sermon or something it's probably to go out and think . Don't get me wrong , it's not that I don't wanna listen to sermon , it's just that I wanna go and think and be alone . So yeah..... And I'm sorry if I made any one mad by disappearing during sermon .