It's okay - once people start to see the light, they will thank you for sharing! Everyone is too busy for everything - unless they choose to MAKE time.
I almost went to UT Arlington to finish my degree, but circumstances changed and I changed my mind. Some of my first memories involve me drawing, but besides a couple of high school art classes I have no formal training in anything art-related. (My AAS is non-art :P ) It's a very serious hobby now.
I believe the best, most productive talents don't come from formal training, but from the gifts God gives us. We just have to figure out how to apply those gifts in everyday life and do something great with them.
Couldn't have said it better myself! :D