According to celebrity hypnotist Marisa Peer, she's found that most of her clients, of whom there are some well known names evidently, suffer with the 'Not Enough' syndrome. This can include feeling like I'm not enough, I don't have enough, I don't know enough (I suffer with this one!) and so on. She has an interesting little exercise for people to do that is fairly quick and easy.
Write on your bathroom mirror in lipstick "I am enough". And when you notice it say the words out loud. You can make it more fun by making it into a song (as i tend to do just because I'm like that :)) or just say the words. Keep at it daily and see what happens, and do let me know any results!
Here's a little clip from Vishen Lakhiani's A-Fest this year where Marisa talks about the exercise. It's a long talk, but interesting enough to hold your interest when you have 45 minutes or so (I tend to knit or crochet while i'm listening).
Have an awesome week!