I have not been rejected romantically, but I have had instances when I was rejected by employers. Not a lot but has happened to me. Mostly it was a reflection of my mental state: say, I did an interview when depressed and as a result did not make a good impression. I have a great job now so these rejections just taught me that it is important to be in top shape for interviews, which was an important lesson to learn. And in no way were they a reflection of a negative self worth on my end.