Hello, my name is Destiny. I have always had slight problems with my knees since I was little. I'm 19 years old, 133 lbs. My mother has problems with her knees since she was little too. Recently, I've had increasing issues with my knees. Symptoms are: pain, weakness, stiffness(like they're rusty), they give out sometimes, they crack quite often, & sometimes they hurt even worse when I exercise(bike riding). I'd highly appreciate it if someone could assist me with knowledge on what is wrong. Thanx.