Why yes, of course!
Because people society deems to be attractive tend to be treated better overall. They tend to be more popular, have better career prospects, are more likely to be liked and admired, and if for whatever reason they end up in court, are less likely to be convicted but, if they are, are likely to get a far less severe sentence (so I've heard). Besides, who wants to look ugly?
In my own personal opinion, no, I think I'm average (about 6 out of 10). However, and I hope I don't sound immodest, I have received quite a few compliments from complete strangers about my appearance. I don't know why, but obviously they see what I don't see when I look in a mirror. I guess looking 10 to 15 years younger than my actual age helps a lot too
I used to have a really severe and prolonged case of acne when I was in my teens and 20's, and it really affected me at the time, and I got into the habit of being embarrassed about my looks because of it.
I have no idea what you look like, but there are a number of things that one can do to appear more pleasing to others. Believe it or not, posture can really make a difference. People who stand up straight, look people in the eye, and walk like they think they're a fashion model tend to be perceived more positively. A person could also lose weight, if that is an issue for them. Being self-confident makes a big difference too, as does making an effort to be genuinely interested in all the gossip and small-talk that so many like to engage in (yes, I know, that's a really, really hard one - I usually fail at that). Wearing decent clothes, being clean-shaven, refraining from the consuption of junk food (especially sugar - bad for one's health), and being clean help as well.