You can do anything you set your mind to.
No you can't because persons have limits.
No matter how positive, optimistic and persistent a person is some things can't be achieved,and some things said are undeniably unhelpful and nothing constructive.
Michael Jordan stunk as a MLB player, and 2 seasons is a large sample size.
Ryan Fitzpatrick a NFL qb that wants to be a Brett Farve QB, and repeatedly chokes in the big games, and isn't a consistent good or great qb so unsurprising 1 winning season in his nfl career.
Tim Tebow wants to be a starting NFL qb except he doesn't have decent or great nfl passing skills, worked damn hard with great passion and still couldn't succeed.
The Buffalo Bills made it to 4 consecutive Super Bowls, and lost all 4 which is a epic worst NFL record because losing 4 consecutive Super Bowls.
Ed Wood a Hollywood movie director no doubt he had a passion for directing movies which was his occupation, and he repeatedly made laughable bad or awful movies which are memorable for the unintended reasons.