Are you tired of everyone calling you a feeder?
Are you tired of sucking?
Are you tired of peacefully farming, then suddenly the entire enemy team jumps you singing trololololol?

Then use the best item in the game -- WARDS!!!

or play Spawn Karthus

1. Do not overextend.
2. Use an escape spell such as Flash or Ghost.
3. Make sure you have your Escape abilities/Summoner Spells when being far enough in to get ganked.
4. Wards, of course.
5. GANK OTHER PEOPLE. Woot.
6. Practice. Makes perfect... sometimes.
What I got... it's all just pretty obvious: common sense.

1. tell team you are going to ignore them
2. /ignore all

or

1. Play Malphite