I'm definitely thinking of putting 0% effort into having something with girls. It's just dumb; instead of focusing into it, I can actually spend time having fun, playing guitar, surfing, travelling, chasing my dream, working out, studying... Hell, I can lead one amazing life, so why the hell am I fretting over 'not getting any'?
Oddly enough, you will probably run into more relationship opportunities if you aren't trying so hard.
You're 17. Focus on having a hell of a good time and learning everything you can.