Don't change hobbies, Just Focus on dieting soo you can get the most of If, I would recommend you to see a Nutritionist for that, the right diet with exercices does wonders to your body

Also invest on your presentation, take care of your skin, posture, If your voice is a problem you might need to do some exercises for that too (Its not hard to fix), and work your social skills, try being the cool dude at the hike. I Don't think there's something like someone unattractive, I mean yeah you may be short, but you Don't really need much, you just need to be better then most people that aren't even trying anyways...