Sprained knee?!

Sprained knee?

Yesterday I dont know what I did but I probably twisted my knee to fast to far the wrong way.Today It hurts to walk on it and it hurts to climb up and down stairs, to bend my knee, or basically move it in any way. I've sprained my other knee before and I've had alot of the same symptoms but last time I felt a pop. It also hurts to run, hop, etc. but I havnt really done that. It also hurts to push out with my knee when I scoot out my chair from out from the table or scoot it in. I am also 14 years old. and should I get a note for gym class. What also do you think is wrong and should I be on crutches or what.

1 month ago
It is also tender, slightly swollen I think and it in tingly and hurts if I press on it especially in this one spot on the side of the knee.

If it was sprained i think it would be swollen, But that's not all that true. If it hurts to put any kind of pressure the don't walk or run etc.Stay off of the leg. If its swollen put some ice on it and rest it about heart level for about 10-15 min (not any longer) about every 20 min. You could have pulled a tendon. Id get a note yes. Go get it looked at just in case. Good luck!