I've been feeling in and out lately?

5 days ago i have been feeling in out lately. I mean it's so weird, it's like i know where i am but i don't feel like i'm really there. For example i was asking random questions out of nowhere and my friend right next to me was answering me but i didnt even realize i was doing it. I even touched her arm to see if i was really there. Just yesterday i had a chorus performance and again i felt in and out. I don't know, maybe it was always lke this but i'm not sure. Any help?