Tell me how to get ';un'; ';royally screwed';?

Before I begin let me just be completely honest. I have just up and left two apartment complexes, I am on chex systems because I owe 200 to one and around 600 to another bank. When I was 15 my ';mother'; used my s.s.n. to get some cable and phone turned on without me knowing. I moved out when I was 16 on my own with help from boyfriend then tried without any help from anyone and made some bad decisions which is why I couldn't pay my rent at two complexes and pay back my overdraft fees to two banks. This all happened 2 years ago and I am totally different know, trying to build some credit and get some money saved up so I can pay everyone back. I realize what happened was very dumb but what would someone here that is extremly good and smart with money suggest I begin doing?