Look man, it's not what you want to hear, but until you can afford everything on your own, there's nothing you can do. I wanted a bike at your age too, I was in roughly the same situation and nothing will change your dad's mind about this. You're just gonna have to wait it out. I finally got the money to do it all on my own this year at age 20 and I told my parents. They accepted that I'm old enough to make my own decisions and it's my money so there's nothing they can do to stop me. I know it sucks, but you're not gonna be able to do it. Also you definitely could use some more money for this. You're shooting for a gsxr 600 which isn't a super cheap bike. If you drop it, you need money to fix it. You need gear to protect your body, and you need the insurance to cover everything else with the bike. It's not cheap and if you can't afford it yourself, you just aren't able to go for it. Sorry man.