It's a game of luck, and that starts at roll-up.
And even if your character is somewhat sub-par*, run it out and see how long it lasts. If it dies early, just bang out another one and carry on. If it lasts despite its shortcomings - and sometimes they do - well, that's the best the game can get....says he, whose best and most-fun character ever started with awful stats compared to her peers.
* - most DMs have a floor of sub-par-ness beneath which they'll let you re-roll from scratch; mine is that you can choose to reroll if the average of your six rolls is below 10.0
or if no roll is higher than 13...which would, amazingly, catch
@Yaarel 's proposed array