Re: getting my parents to understand guitars my life?
Treat it like this. Music is now part of your life. You are young so don't rush decisions and incorporate a lot of experiences into your life and see what sticks. Guitar stuck for me, but football, hockey, skateboarding (me too bro) didn't. My parents weren't against me playing but when I wanted to "be a pro" they probably rolled their eyes. They too were always telling me not to blow my money on gear. Now I really appreciate it, I know that I'm glad I've turned down some great deals only to see that in the end it was a good choice.
They know things we don't. Actually now that I'm older and married I see a lot of what they were seeing in my students (I'm a teacher) you have to understand that:
1. Kids need to work at what they want to do, so we can't give them everything, nor allow them to take the easy road all the time. This also proves how motivated they are about their dream. I
2. Reality is reality. Here's a stiry to show you: I was in a successful band in my hometown area and surrounding counties, I quit eventually but they continued and got a record contract. You're thinking that's cool, but now they have no money and they have to find some way to generate cash all the time. They were dropped from their label and they haven't been picked up again. Their crowds wain and they are still putting college and careers on hold. It's not because they aren't good enough. When I left they stepped up and they are as good as any other band in the genre. IMO better than most, but reality is reality: it takes more than pure skill.
It takes lucky breaks, a lot of sacrifice, being in the right place at the right time and so much more. It's extremely unlikely that a young guitar player will become a successful musician. The world loves to say follow your dreams and to a point it's true but it's not always as easy as that, it's more than just hard work, and life isn't always fair. Your parents know a bit of this and that's why they act the way they do.
3. In the same way learning to be a responsible person is more important that learning anything else. That's why you just can't spend whatever you want, they're trying to teach you that someday you'll have a bigger more difficult choice to make and you have to start learning now.
I know I sound like a camp counselor or something, but it's true. Don't let it knock you down, be patient worry about your skills and your abilities, not gear. Try to become so good no one will deny you're serious. Show them through that, that you deserve a little bit of room so you can buy some gear. Show them you are responsible with other things like school, work, money and all so that they'll trust your decisions more too. Remember in 1 year there will still be cool gear to buy, and in 5, and in 10. It's not going to vanish so you can wait and you can practice while you do.