Yup, but if you can't pull it down without great pain or lots of lubricant you still need to see a doctor, it really should just easily slide down with no issues.
you have a condition called Phimosis. 1 out of 10 boys have it, i have it too but i get along perfectly. also your knob cant fall out of your foreskin because its connected to your body. so is your foreskin.