Physical disability has no link with mental disability. One can still be sound mentally even if he/she is not sound physically. One can still attain any goal in life irrespective of physical challenges. The only person that can stop you is just you.
Physically-challenged people are not making waves just in sports; they are also making waves in various aspects of life, like in academics and innumerable other fields. They have won accolades for themselves in the music industry too.
Do not be surprise if you see a man with stumps for arms playing musical instruments in the most sonorous manner you have ever encountered in your sweet life. Do not be surprised to see a man with no arms using his feet to hold drums sticks and playing drums in the most interesting and musical manner.
There are several physically-challenged that can play trumpets and sing and dance far better than the so-called normal people. You may think this is impossibility, but wait till you see one or wait till the next Paralympics events and you will be transformed to a believer.
Conclusion of this is that there is nothing you cannot do. Provided you set your mind to it, you can get it done. Success and failure, ability and disability are all in the mind.