I guess you need to get over feeling awkward :-)

You successfully started a business. Not many people even try to do that, and of those who try, not many succeed. You have created jobs that people are evidently happy to have. In short, you have come by your wealth honestly.

The only other thing I would encourage you to do is, if any of your employees express interest in the entrepreneurial path, encourage and even mentor them. Maybe even be their angel investor, if you believe in them and like their idea. That would be a great way to give back to the world out of what you have received.