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why do I collapse so frequently?

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I got a problem.Everytime when I stand for some time,I need to sit down otherwise I become pale and collapse.yesterday I even collapsed in a bus.there wasnt any free place where to sit so I was standing and after 10 min I felt sick,hot and then I collapsed and I have been feeling like that for last 2 weeks.my family says that its because I dont eat a lot,but im size 12 and I eat a lot of weets and fatty foods,but I dont eat meat. I just dont understand why everytime when I stand I collapse?is this normal? if I dont get sit down,my eyes shots down and I only see black. I dont know how to explain this,but I hope you understand.I wanted to go to doctor,but im scared,that doctor could say that im ill.has anyone have any idea what could be wrong with me?