Some great thoughts about design from my pal and fellow writer at The Industry, Gannon Burgett:
Design is human. Design is what connects individuals with the items they interact with on a daily basis.
To riff on another Steve Jobs speech; look around you and realise that all the items making up your life were designed by someone, somewhere. There's no reason why you can't design something else which will change everyone's life, too.
Not everyone will get good design. It's too subjective. Taste plays a huge part in understanding when something is truly great.
I find it more important to be sure of your design taste than to be sure of your skills: it's possible to increase your design skills over time, so long as you have a goal. Taste provides the direction to that goal.