I love this question! I have 3 answers, each being equally important:

* I try not to suck at much... I mean come on, who wants to suck at anything?

* The things I suck at I try to overcome. I used to be a poor endurance athlete, so I trained up and have since finished in the top 10% of something like 6 triathlons, 2 duathlons, ... Sucking at something is a great motivator - never forget that!

* And... the most important answer... there are some things I suck at - whitewater kayaking being the best example - that I know I will always suck at. But I still do it because it keeps me humble. Keep your humility always!