No. You are free to do whatever you want with your body, as long as you feel as if you are in a safe environment. It also depends on if you are fingering yourself or if other people are fingering you, because adults are not allowed to be involved win people under the age of eighteen in that way. Also, it is illegal to be sexually in lodges with a person who is four years older than yourself and over the age of eighteen if you are still under eighteen.