I know I'm forgeting something......

Is there a medical condition that causes poor memory? I'm not talking about alzheimers or dementia, and I'm not talking about silly memory lapses. You always hear people complain about being forgetful, calling them "senior moments" or attributing it to being an air head. I have trouble remembering things, everything from where I put my keys to appointments I have, and it happens so incredibly frequently that it honestly isn't very funny, it's embarassing. I've tried keeping lists and planners, but I always lose the lists or planners, or forget to write in them. In school I would forget about assignments or forget when they were due, or forget what the assignment was actually about. I'd forget what was said in class, I'd try to take notes, but i'm horrible at note taking- and i'm not just saying that to make excuses, I really am horrible at taking notes. I'd take notes on all the wrong things, or I could never keep up with the teacher and what he was saying. Now it's things like misplacing very important items on a daily basis, or even putting them somewhere safe where "i'll remember it" and yet still forgeting. I have a special place for certain items to make sure I won't lose them, but i still lose things so incredibly easily. Then there is the appointment thing. If I don't think about an appointment the night before or the morning of I will completely forget about it. And even then, I can think about it up until a couple of hours before and I will get distracted and still manage to forget about it. I'm very frustrated with myself, as you can see, it is very discouraging. I want people to be able to depend on me, but I don't know what to do when I can completely forget about something so easily.