Coming back on the forum after a little break has really put this kind of stuff in perspective!... It's plain to see how toxic it can be and how neurotic a lot of the users are.
I also advise you to take a break (I mean MrHandsome and people like him especially). My height dysmorphia isn't totally better but it has recovered a lot in the time I spent off this site. At 5'9" in a one inch lift I feel very average now and take a more sane view of my height, whereas before I always felt short and insecure even only being 1 inch off average (which I now see is a small difference).
1) Yes 5'8" is fine and personally most of my problems have been in my head. Some girls would tell me they didn't like my height, always girls I wasn't interested in anyway, but it has never been what has stopped me from getting a girl I want. I do not feel like men have generally respected me less for my height and if they have (only a few times when I was a teenager) it didn't bother me too much. I do want LL but I feel my reasons are a lot more personal than this and to do with my own perception of my body, really.
2) So many women just don't give a crap about height. A girl I am seeing at the moment (she is 5'4") teased me about her hot housemate. He's a few inches shorter than me. I think a while ago she told me she liked tall men. But really I think it's one of those things a lot of girls think they care about but don't, or one trait among many others for most women, who don't fetishise it really.
3) It's statistically true that short people in general are paid less (there are loads of articles about this on the internet). But so are most people who aren't attractive white men. If you really pity yourself over this you should get some perspective and/or do something about it.
4) OP, you didn't stunt your growth much. It takes serious malnutrition to stunt growth- anorexia does, as does famine. If you were just skipping meals, or eating a lot of junk, or not always sleeping enough, your body has loads of catch-up strategies for growth to deal with that (there's plenty of research done into that for e.g. kids who smoke or are on ADHD meds and stop over a period of time experience accelerated growth over that period). Don't beat yourself up- you're feeling guilty because you have a psychological problem with your body which is OK and understandable. It's just the genetic lottery that you drew a, subjectively speaking, bad card in.
You are many things apart from your height! Imagine the primary trait in someone's personality was their height, or even their most attractive feature... They probably wouldn't be very attractive or interesting (I don't think most women look for height primarily in a man, I think generally your face or body type is more important, even though height does matter to some degree to most women).