That's your problem. TDM is where all the new players play, and sense there's no objective other than to stay alive and get kills, the corner is a great habitat for the new player.

I'd recommend trying Domination, Blitz, SnD, FFA, etc. Much less getting shot in the back.

Also, you can play in Clan v Clan where dogs aren't allowed. Well, no killstreaks other than specialist perks are allowed. It's kinda like League Play in Blops 2 but there's no seasons or ranks. Just CODEsports rules and such.