Is it normal that my moods change often and sometimes i feel nothing
I'm 17 just about 18, I have a normal family, friends, and a part time job, I live a fine life....just why do I get into moods where I cant stand anyone at all, il just want to be alone, all day, every day, suddenly I'm useless and horrible, I hate myself and feel like no one wants me around (self harm happens at these times), but then a week or so later I can feel "on the top of the world" and run around and be happy, I can go from being your friend to wanting to punch you in the face in just one bad comment about me or something related and yet I still just stand there with a fake smile all day, every day, apart from those two feelings I also have times where I feel.....nothing.... I think of nothing, no voice in my head (I don't know if it's normal but I'm one of the quietest teenager that people will meet yet il have entire conversations in my head, pretty much what I don't say comes out in my conversations in my head), but back to the point, at times I don't even have that and everything I do just happens, all my impulses and words just start to pour out, I start getting into fights (not ending too badly for me considering many years of mixed martial arts and general fighting practice), one of the worst things, and quite possibly best, that I do it is become addicted to things extremely quickly, such as computer games, fighting, relationships (only been in one) and generally being better at specific things then most people, sleeping patterns.... Well there is none, at times il go to bed at like 8-9pm because I'm to tired to do anything and have been all day or il stay up all night or get like 3-4 hours sleep at most.... Honesty I don't believe this is normal....is it? :/