If your only/easiest sexual options are fat and ugly chicks, you are thinking too highly of your own looks. Fat and ugly girls are your lane and where you need to stay. You really need to find the least ugly and fat girl out of the bunch and roll with that. Stop holding out for a "dime" that you don't even deserve in the first place.
Think about it, if EVERY person you're having sex with you consider some sort of downgrade then YOU are the problem. You are ugly and haven't realized it.