What you can do, you can do. Whatever works, work on that. Don't wish you could do things you can't do. Instead focus and build on what Is already working. Everyone who got where he is had to begin where he was. Only few people really know how to live in the present, the problem is that we seldom think of what we have instead, we think of what we lack.
We don't need more strength or more ability or greater opportunity, what we need to use is what we have.
People are always ignoring something they can do while trying to do something they can't. Learning new things won't help the person who isn't using what he already knows. Success means doing the best we can with what we have.
My favorite quote from Norman Vincent Peale, "we've all heard that we have to learn from our mistakes, but I think it is more important to learn form our successes".
If you learn only from your mistakes, you are inclined to learn only errors. Every ceiling when reached, become a floor upon which one walks and now can see a new ceiling.
Every exist is an entry somewhere(Tom Stoppard).