I Hear you lil brother; I lost my Dad when I was 21 yrs old. I felt pretty depressed for a while and isolated myself as well with CPU games and started drinking heavily... then one day I decided that enough was enough; either I was gonna blow my brains out or I would stop whining, being depressed and will move on with my life.
Which I did; I was already active back then and I got even more into sports, team sports mainly, hockey, volleyball, broomball, etc. As well I forced myself to block out all the negative thoughts I was getting. Soon as I would feel one coming up I forced myself to think about something else. Soon enough I met new people, got out of the house, had a great social life.
My point is, you cant stop, you cant let yourself spiral down like that; whenever I felt sorry for myself and felt like ending my miserable life I would start thinking about all the poor people that get sick, get cancer and all they wanted to do was to live; I would then tell myself that I owned it to them to enjoy life.
You are 14 now , its gonna sound cheezy, but you got your own life in front of ya; Playing computer game is fun now and then but if this is all that you do with you free time you will end up feeling alone and depressed; Join an improv group, go to karoake place, get out there, meet people, have fun; enjoy the power and freedom of your youth man... chase girls, stay up all night at parties; the point is you gotta get moving because it is not fair to those who will never have the chance to.