A couple things:
A: If you're "shit" like you say, don't bother. Won;t make any difference, and may hinder you as you'll think "might not try that in case I hit my forks"
B : Cap uses them and although he does some big stuff he won't be smashing them against walls / rocks too much (cue the Tarty beys saying he does etc etc ) Thats what will weaken carbon, damage to the weave. You could be the lightest rider around but if you hit them into walls thye will break before someone who is heavy and does big stuff but doesn;t damage the weave.