Am i going tru my growthSpurt (10 Points)?

Im 16 an i just started getting pimples idk if its because i shave for my mustache to grow faster bt idk.for the last ..bout 5 days my knees hurt when i bend them or do a squat or anything like that also this has happened before is it possible to have more tgan 1 growth spurt and is this what is happening to me?