As well-meaning as Allison may be , saying you are "22 and have been hiking all your life" does not necessarily instill confidence in your range of experience. Most of my gear is older than you are. This is not to say you don't have some experience or that I have more, I may not, but as OM and WD pointed out, going solo safely is very dependent on where you are and under what conditions.

I don't encourage anyone to go solo unless they have some experience hiking with others. I used to teach scuba diving. I dealt with tourists who were too scared to get off the boat because of a little wind chop and supposedly they were certified divers. My point is that conditions and experience are everything. I solo winter camp in mild conditions, but my first trip was with an experienced winter camper. That trip helped me a lot. After that I could figure out the rest.

As the saying goes, "in theory, theory and practise are the same, in practise, they are not."