Why am I having alot of hairloss?

I'm 20 yrs old, and the past few months I've noticed I have been losing more hair then normal. I know it is normal to lose so much hair a day, but lately I've noticed probably 2x as much hair falling out then what used to.. I havent had any change in medications, or a significant change in my diet as i've heard that may cause hair loss. My hair is naturally wavy, frizzy, and dry! I feel like my hair is just weak, and is breaking off.. Does anyone have any recommendations on why this may be happening? or does anyone have any ideas of shampoo & conditioner that will hydrate and strengthen my hair? I just recently started taking hair, nail & skin vitamins in hopes that will help too. I want to consult in the general public and see if anyone has had this problem before and what they did to have significant change.. If i cant find anything that helps I will most likely go to a dermatologist and see what they suggest. BUT if anyone has any suggestions, PLEASE HELP :) thanks a ton!