Moving on/dating

Why I'm I finding it so hard to move on and date? My ex boyfriend and I have been broken up for about a year now, he was the only man I been with(my first) and we have a 4yrs old son; I don't know what's going on with me. I refuse to give people chances to date them, I always try to find dirt on them and then stop talking to them..I guess I'm not ready to date or I'm afraid.. Any suggestions?