You can click under the reality check tab and there should be a red x delete button there that says remove.
5 is average. 5.7 is slightly above average. Given the fact you're 42 on a website dominated by the 25 and under crowd, I don't see why you'd be humiliated. I mean if you were getting like 2's and such, then yeah, that would kind of suck. But still, you look like you're in good shape, no facial features that make you look odd or asymmetric or anything. The hair style is probably what really bumps you down for me at least. It's a personal preference thing though, long hair is very feminine and so many guys find long hair attractive. I would probably put you into the 6 range. Above average, but like I said, the hair style probably knocks you down from a 7 for me.
I wouldn't take it to heart though, I find attraction is majorly in mannerism which is very hard to portray via pictures. Take Rachel McAdams for example. By picture, she's a solid 8, but her mannerism and such definitely bump her right up to a 10. So don't worry about it too much, especially not the people commenting. People LOOOOVE to troll.