Why do I not feel like myself anymore?

I dont know if im stressed or something but il take any advice. Since I’ve started my 2 week worth of days off work I really havent felt like myself anymore im not sure if its depression. I’ve had a few IT realated issues that have anoyed me abit but my job is IT support so yea that shouldnt stress me to much. Either way it feels like im not myself anymore and as if my minds gone to sleep if that makes any sense. Its like I plan to do stuff in my mind and end up not doing it, I do feel really down sometimes aswell and it feels like nothing can pick me up. Feels as if nothing can make me happy right now and even though im off work at the moment which I’ve wanted for ages I feel bored even though I shouldnt because work is boring. I dont understand why my minds in this state. All the things I wanted in life like a girlfriend and stuff working, is happing. I met a girl but she doesnt intreast me and that makes me feel depressed for some reason. Theres things bringing me down when they shouldnt be. I just feel like screaming out loud but I know it wont do anything. It feels like I hate life and im bord with it. It also feels like I feel alone most of the time, even with friends and family I still feel alone. Im 19 now I dont know if its down to me becoming so matured at a early age maybe :S

Do you think im stressed or depressed maybe? Anyway if you can get your head around this complex thing please offer me any advice you can.