Yes, you'd know if you busted your eardrum. It would hurt like hell.
You probably have wax build-up blocking the ear canal. You can buy an OTC treatment, a syringe with a solution that might dissolve the wax. But you might also have to go to a doctor, because the clog might be too tight to let the solution get to the bulk of it.
And doctors, or Orson Bean, will tell you not to put a Q-tip into the canal, but that's what they are made for. You just have to be careful. Doctors also tell you not to pop zits, lance boils, take out your own stitches, or dig out splinters - because if you are an idiot, you can really hurt yourself. They have to tell you that, because, for all they know, you might be an idiot.