Doctors

Do doctors actually go to university for 8 years to learn how to tell patients their problems are just normal? You see there is something wrong with me, I know there is. I've had a nurse as well as a pathologist tell me that I really need to be referred to a hematologist. Over the summer I was constantly breaking out in bruises for no reason whatsoever, and I don't mean one or two here and there I mean 20-30 all over my legs! Well I went to my doctor last week about it and he of course sent me for useless blood work. Today I had to go get the results and as usual the blood work came back fine, however he didn't check my blood count, etc...He only tested my platelets and their functioning and for one blood disorder. And then he had the nerve to tell me the reason I am bruising is because my skin is thin, so t's just all caused from trauma. Yes doctor I've been bumping into things with out knowing it 30 times a day, that must be the problem. I know I am no expert, but he's only a GP shouldn't he atleast send me to a specialist. The thing that scares me the most is it could be leukemia...yet he is dismissing the whole thing. I've seen way too many people listen to a GP only to find out in the end they really did have something life threatening wrong with them. I want to stand up for myself but am too threatened by my doctor's education to say anything. What should I do???