Do not limit yourself by your own words.
Words have power. When you speak about yourself be careful not to limit your potential with negative words.
Labelling yourself as a slow learner or bad at sport will only help you live up to the negative expectation you have created. Limiting yourself with negativity will cause you to abandon the positive actions required to achieve your dreams.
How many times you heard the words "that's impossible'? Something is only impossible until you choose not to accept that it’s not. Apply this idea to your life - don't have boundaries. (Of course within the law, harming other people is not acceptable).
It would be a lie to say that all labels are wrong. The only label you should accept is "one who takes action". Then: When your world has no boundaries, even the sky is not a limit.