Have you ever wanted to do something but was discouraged because people told you that you cannot do that something? Well, it is but natural to doubt yourself sometimes esp. at times when you're feeling low. But try and manage to bounce back and see things from a more positive perspective.
I'm a believer of positive affirmations. You are what you believe. You can do what you believe you can accomplish. So next time you find yourself doubting, STOP! Positive affirmations work. Just as Zig Ziglar said it, "Other people and things can stop you temporarily. You're the only one who can do it permanently."
Keep on believing in your success! ^_^