How do I know if I'm good enough to start charging for photos?

I started photography about 1 year ago and I appositely love it. Capturing moments/things I see in time just too fun. Recently some of my friends have been talking about how I should start charging people for taking there photos. I have taken photos of people before, HOWEVER its only been photos of my friend's. Compared to other's in my school that charge for photos my work falling in the middle. This is where my dilemma is at, I do think that making money off of my pictures would be great, BUT I'm still rather new to photography and don't know if my work is good enough. (I run a canon R50 with a sigma 2.8f 18-50mm)