So ive been dating my bf for about a year and a half..?

So like i said ive been dating my bf for about a year and a half. Im almost 16 and hes almost 17. We get along great. We've even already had and we were both very ready. Anyways.. So my bf is very smart and gets almost a 4.0 (hes not a nerd dont worry :D) He's very hard-working and loves to make money. At age 15 he bought his first mustang and at age 16 bough a newer mustang. He treats me very good. Problem is.. i get a 3.0 if im lucky. Im broke as all hell and i cant get a job til im 16. Im not a very hard worker and i also tend to get bitchy around my time of the month.. haha. Im worried that im not good enough for him and that he'll realize this one day. Do you think im over reacting and do you think well most likely last?