Why am I not growing?

I'm 17 1/2, like 5' 5 1/2", my dad was 5'11 an mom was 5'2 when they had me. (they've shrunk in 17years :p) I've been havin pain in my knees an get stiff when I sit for like 10+ mins. I'm all wobbly in the morning, an I can eat again after a meal in like an hour. This has been going on for like 2-4 weeks. I've had ppl tell me I was growing/having growing pains.. The problem is I haven't been growing in past few weeks/months.. Why is this? Is it because my body is "tricking" me? Am I about to grow in the next month or two? What's the problem going on an why ain't I growing? Thanks for honest answers guys. God bless.