Sure you can have an epic beard, just let it happen! The open areas on the chin is nothing to worry about, it will be a feature, and your mustache is good enough to balance things out. I agree with not trimming it - also not the top, directly under the nose - are you doing this? Dont! Let it grow out a lot more, I know it sounds crazy, and hairs over the lip can be very annoying, but with length, all gets better.
Keep growing!