Can you get arthritis at a young age?

My fingers always feel like the need stretched (like if you where to stretch when you wake up) or cracked at the knuckles. Also if i have been sitting down on the floor and i get up my knees feel stiff and crack. Im not unhealthily or overweight, I go to the gym with my friend or jogging. But i have been a vegetarian since i was 5 and I'm now 17, so i am probably lacking a lot of vitamins. I could be anaemic to, i am very pale and my nails are so weak, but anyone able to give advice? Thanks!
Can you get arthritis at a young age?
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