As a child I struggled for the "A" in art class. I rarely got it. I often miss the mark and get discouraged with the quality of my work now—it's so difficult to "get it right".
People say nice things; however flattery is deceiving. These aren't professional art critics. My work is nice (sometimes), but not professional.
Professional takes a lot of hard work and time. Professional comes from a 4-year art degree. If you're lucky, and persistent, professional may also make money. (In my portrait studio I was professional, but neither lucky nor persistent.)
I resolve to have fun with art and not take myself too seriously. I've got a day job, so I don't have to sell my art (Note to self: bow down and worship boss).