"Keep people in your life that truly love you, motivate you, encourage you, inspire you, enhance you and make you happy. If you have people who do none of the above. Let them go!"
Ask yourself this when someone says you can't do it. What's holding you back? Exactly. Nothing but them and you, but only because you are letting them.
Dear Self. You know what they say about perfectionism...don't you? Why you don't have to be perfect, and in fact it's necessary that you don't try to be.