Hi I Am A 16 Year Old And I Have

Hi I am a 16 year old and I have discomfort in my knee. I was running and jumped to avoid something and landed on the ground. (I think it happened in air because I didn’t land on my knee) That was five or six days ago, and I have had a dull pain on the outside lower part of my right knee. It is fine when rested, but when I fully straighten it or bend it all the way, there is some pain. Swelling is minimal to none, but when I walk, it occasional locks and hurts a bit. I can walk mostly normal, but locking does occur if I take too big of a step. What could this be? Is it serious? Do I need to consult a doctor in person? Any medication to take? Healing process? Thanks, please reply soon.