Hair straightening?

As odd as it is for males to be concerned at all about their hair...

I'm really in a bit of desperation.

My hair is naturally thick and curls in the back and sides when it becomes long. Especially when outdoors in hot weather, it becomes very thick, dry, and out of shape. It drives me the f**k insane.

I'm interested in thinning in out and allowing it to hang loosely without requiring half a galloon of gel.

I know the proplem isn't length because I see manyyy people whose hair is twice my length and could be seen as perfectly straight (half of which are chicks, but hey, what's there's in mine).

I'd like to have a similar hairstyle to Tomo from 30 seconds to mars.

I like it long in the back and all-over thin cut.

Any specific gels or moisturisers that would straighten and allow it to hang loosely without build-up and thickening would help immensely.

-also...I'm not wild about flat ironing. I'm too worried about damage and I'm not very skilled with it.

Thx!