insecurities about exes

Ive known this boy since year 7 but never really spoken since we were in separate circles (we are in year 12 now at the same college). Weve been speaking for about 6 weeks now and i cant help feeling insecure about the fact that all his past relationships have been with really gorgeous popular girls:(

Anyone have any advice about how i can get over this? He seems to like me and i really like him but i dont want to start a relationship thats going to make me feel insecure and upset all the the time because of my insecurities:(