Finding it very hard to remember things...?

Have you had any recent falls or hits to the head? I'm not trying to be funny when I ask that - that really can be a sign of head trauma, and even with you being very young the possibility does exist that you may have had what are referred to as mini strokes. Granted, if you're in overall good health, with your young age, the chances of you having a mini stroke are very slim, but like I said, the possibility does exist. There are several cases where people have had mini strokes (even at a young age) and never really presented any signs of a stroke while the actual stroke was happening but then have these brain function problems similar to what you describe. Perhaps you should call your Dr and ask to be checked out?