You don't need a coach. Certainly, there's nothing wrong with getting one, for what the riding you want to do.....just ride. I got faster from riding with faster groups, but I only did that after I had a pretty decent base and good handling skills. Just push yourself; you'll get faster.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher