Collect the positive comments people give you and write them down. Put them in a journal, write them on slips of paper and put them in a jar, put them on posters! Don't forget to add your successes to the journal and to the slips of paper.
Make a poster with all the positive comments people tell you.
When you feel a little blue, or having trouble with your motivation - take a look at the journal, or the jar, or the poster and visually see what people are saying about you!