Within your imagination are magnificent dreams and the only one that can stop you from accomplishing them is you.
Separate yourself from or ignore those people who don't believe in you and then go out and do something bold, something that will amaze us all. For most of mankind's greatest achievements were attained by "ordinary" people, supposedly against "impossible" odds.
Right this moment, in various places in the world, there are "ordinary" people taking action on what will become extraordinary developments. Why shouldn't one of those people be you?