Can someone please help me. Knee Dislocation

Hi Iam new to this site and I am 21 years of age and i was looking up information on knee injuries, I have the same similar happenings as all of you. I dont know what to do Ivve been to therapy but that doesnt seem to help and I have been to a doctor that specializes in bones and stuff. And I have a surgery date to come yet I hope but I dont know what the problem is the doctors dont tell you anything and it happens when ever it feels like popping out and sometimes it gets stuck and i have to push it back in myself. I also find it strange that every time i asked one of the doctors about the strange bump on the side of my knee on the inner side they dont tell me. I mean this all happened in sixth grade and ever since I have been falling down stairs and on ice and everywhere you can just about imagine because it keep popping out. It hurts like the dickens and I am afraid that the next time I fall it may break something. I have ended up with bad bruises because of falling down stairs and i am tired of it happening. I just want to be able to run and do anything I want like I use too. I cant ever exercise run because it happens. My shin also hurts feels like pieces of bone are moving around and lately I have been getting these sharp pin point pains in my knee when I am just sitting down casually. If someone can help me please help. I am unsure of what to do exactly I want my life back.