Jeez, chill.
Firstly, its a game. Calm the hell down.
Secondly, if you want to beat Teemo, then tip: Go in when he tries to poke you with his blind. After he Q's, during that moment of immobility from the pause, turn and jump on him. If you can't or you lose anyway, try going in after. If he's using a retreat tactic, use that to your advantage- everything of his is point-and-click. Hide in a bush and zone him from CS, you'll slowly gain and advantage as you walk out and CS and he can't get any. Once you're ahead enough you should be able to 1v1 him. If all else fails, then pull lane to just before the tower and try to keep it centered there, and farm up, then when he leaves to recall push the lane and either recall yourself or try to gank mid. During all of laning phase, take advantage of his slow push by trying to tp-gank mid or bot(tell them to set a ward in the far end of the lane so you can gank without the enemy just walking away) and getting your bot or mid laners fed. You may be useless but at least your team isn't.
Also, if Teemo is such a problem to you, try Irelia out for a little bit and get used to her. She's simple and hard counters Teemo(and pretty much every top laner). If the Teemo is good you'll lose until level 6, but when you get level 6, don't hesitate to go in unless you're oom.