Your quote says there's only peace, knowledge, serenity, harmony and the force. Seems like you aren't living up to that very well though. Dude, I don't even have any hair because it all fell out. I'll be 19 in 2 weeks, and I don't give a damn. Learning to accept yourself is a long process which might even take years from when you're first aware of your flaws.

What helped for me was to live a better lifestyle, for example eat healthy, and I've been kickboxing for a long time now as well. I even jog in my free time. But there's one very important thing, and that's switching your thoughts from negative ones to positive ones. How I achieved this was stepping out of my comfort zone, don't see what the world has to offer but show the world what YOU have to offer if that makes sense to you.

Also, sex is not pointless. Sex is awesome.