In reply to mayhematic:
I think you'll get a lot of support for having the courage to be honest and speak out. I second what the others have said - if the competition environment doesn't help you, don't do it. I love climbing, but I don't love indoor climbing, I just train a bit to keep myself strong and fit for the real thing.
Get yourself really inspired to get out on some trips in the summer: particular routes you want to climb, which will be experiences you'll remember for the rest of your life. If you're not used to climbing outside, a trip to Pembroke, say, could totally blow your mind and give you a completely new outlook on climbing. Losing weight is not very helpful in trad climbing, if you're already a good indoor climber then you get better by gaining experience, not by extending your physical capabilities.
Have a look at some photos and get yourself some guidebooks, and find some other climbers who have similar aims (and perhaps a bit more experience outdoors) and if it inspires you then start making plans!
Here's a video of some accessible classic climbing in Pembroke for a bit of inspiration for UK trad climbing:
http://www.ukclimbing.com/videos/play.php?i=1794
I'm not in a great position to give advice, but I guess you need to keep reminding yourself of what sensible priorities look like. Being healthy improves everything in life: you have more energy, you give yourself the best chance of self-confidence in the way you look, you give yourself the chance at fulfilling your potential in education, etc. It really is a very good idea to eat well, do lots of exercise and get plenty of sleep. Being healthy is really important to help you enjoy life. Climbing half a grade harder is not.
Post edited at 13:08