Jinxed,
One thing I would add to what Falcon has said, and this is undoutedly true, if you keep focusing on negative things, you will feel low.
I'm no looker either, but whilst it will be hard to ever make myself believe that I'm visually attractive, I can choose to not dwell upon it. The less you think about negative things, the less time you worry, think to death, allow to permeate your mind, those negative things, the less important they become. Think about them all day and they will become the biggest thing in your life. You can put a stop to that!
Falcon's idea is to find a positive angle on things. If you find it too hard to tell find a positive to say about your looks, then just think of something else positive about yourself. Most important, don't dwell on the negative, but still practise trying to find positives to directly replace negatives.
It takes practise but whenever you find yourself dwelling on negative thoughts about, for example, your appearance, stop yourself. Become more aware of your thoughts and stop yourself going into sessions of negative thinking which might then leave you feeling low all day. Also, ask yourself how much of this chatter going on in your mind is self pitying? Try to catch yourself feeling sorry for yourself and then tell yourself to stop being such a baby. This helps me, for sure.
I'll give a wee example of what has happened to me over the past few days. I received an invite to a job interview a few days ago. The letter said that as part of the interview, I would have to prepare a presentation for the interview panel - ie. get up and talk in front of them with a powerpoitn presentation. The thought of it made my stomach turn. The interview is not for a few weeks. I immediately began worrying badly. I kept on going over in my mind how bad this was going to be and yet I would have to worry like this fot the next few weeks until the interview finally comes. I barely slept a wink that first night. Next day, realising I could not go for the next few weeks with so little sleep and so much worry, I forced the thoughts about the interview out of my mind. Whenever they tried to come back in, I forced them straight back out again. It worked, I started to feel much better. I slept much better the next night. I know I could easily allow myself to start thinking about it again to the point where I make myself sick with worry, but I'm not allowing it!!...until now, to type this up..hehe... Anyways, it's a great trick to learn. If you focus on negative things, you will feel down, so change what you think about!! It takes practise and effort, but keep doing it! It does work.