This seems like 100% user error to me, Everything you've described is a direct result of your own (poor) actions. Starting in Multiplayer, Why? Starting on a server with the hardest settings, Why? Being attacked through walls, No, Doesn't happen. You've really given yourself no chance to enjoy the game and that's really unfortunate. Hopefully you remedy this with maybe watching a few beginner guides. Once you open yourself up to the idea of learning the game you'll very quickly find it to be really, The best in it's field.