Do you think it's dumb? If not, why do you present it like this? Have some faith in yourself!
Does this service give value to people? Is it needed? Maybe it's so simple it's genius, not dumb, and it is amazing how you are the first person to think of/ execute it...
My advice to you is: a. have faith in yourself! You are amazing (we all are!) and you can do everything (it's true, you can!)! b. if you still have doubts, ask your friends and family if they see value in it. Don't forget that it is very easy to think why not but what you really need to think is "hay, why not...?"
Sorry for the Zen like answer, but I truly believe in this attitude.
Good luck!