I was very thin at 20 and completely bald by 22 (29 now and nothing has changed). I'd prefer to have hair, but it has never been an issue in my personal or business life. I was never turned down by a girl I seriously pursued. My wife thinks I look fine bald and she knew me before. She actually was interested in me originally because she said I had "cool" hair when she first saw me.
As my hair got thinner I began cutting it shorter and now buzz it as low as possible a couple times a week. I also grew a curly mustache a couple years ago so I had a little something to work with. I get compliments nearly everyday on it now.
Being bald young might have actually worked in my favor professionally as it made me look older than I was. I was young (early 20's) meeting with manufacturers in Europe to get contracts to import their products to the US. I think they would have been a bit worried if they knew they were dealing with a 21 year old. I looked like I was young 30's and I seemed like I knew what I was talking about so they didn't question it.