That you can be happy, can be happy. Yes, you live tired, with motor problems (I speak of body), heaviness of limbs, and without being able to do a lot of "effort" because't you get tired at the end; but you can live happy, how to not.
Simply rejoice, you're alive, and you don't need more. No worry of it all. Make sure you have good friends, because they will, without a doubt, they will protect you more than anyone else.