13 and i really want to dye my hair?

I am 13 but i look and act a little old for my age i guess, and I turn 14 pretty soon. And a lot of my friends have dyed their hair. I just want to use a semi-permanent hair dye (which is supposed to last about 6 weeks) just to experiment a little and do some fun stuff (I'm thinking maybe coon tails). I asked my parents over the summer and my dad was kind of close to saying yes but my mom said no (my mom ALWAYS says no to stuff more than my dad). My dad has a thing against facial piercings, because my friend (whose 4 months younger than me by the way) got a nose stud and i asked for one. He gave me this lecture about how permanent it was and I understood and I know I'm a little young for it anyways. He told me within that lecture that he doesn't have problems with non-permanent stuff. I didn't bring up the hair dye then because I was scared he'd say no. I have scene hair but i don't style it that often because my hair is really hard to straighten and stuff. One problem with my dad is he's really into the natural look. He won't let me get a keratin treatment because he thinks i should learn "to accept the natural way of my hair" no matter how stupid it makes me look. Another problem (and this is why the whole "my friends have it" thing doesn't work) is that he thinks all my friends are spoiled. I go to a private school and I know why he thinks this. Example: my friend dropped her blackberry in the toilet ON PURPOSE and her dad buys her a new iPhone. this same friend also has a house on Martha's Vineyard (I've been there its REALLY nice) but she complains about how much she hates it. My parents also get annoyed easily. In the past I've tried begging them for stuff with PowerPoint, or letters or packets (including a second ear piercing, a helix piercing, feather hair extensions, going to warped tour and voice lessons) all of which FAILED. Although this year, I asked subtly for a puppy and i just learned about it a little and told them the facts and the logical stuff and they said yes. I only actually asked them once and the n they asked me for some information (like the breed, where i could get it, food brands, etc) and then a few weeks later they let me get one. I didn't make a PowerPoint or anything like that. I'm not sure if i should try the whole letter/PowerPoint thing again on this because its never really worked in the past. My mom particularly is kind of irritable and she gets very annoyed when i have her sit through a presentation like that. The problem is, I don't know how I should ask. My dad has some objections to the whole scene look, but he really only shows them when he's in a bad mood. They both teach at public schools, and he always says how "he doesn't see anyone that looks like that" and to be honest I'm not THAT scene. He otherwise seems pretty excepting. He wants me to "be myself" and all. (to clear things up if your confused, he thinks being scene is just trying too hard to imitate the bands i like so therefore he doesn't really see it as being myself) My parents also work kind of hard to put me in the school I'm in and I'm in all honor classes so I know that they value the whole education thing A LOT. i get report cards in October or maybe November I think (possibly even late September) so if i do really well it would help A LOT. My parents do worry that stuff like piercing and hair dye would negatively affect my academics so how do i prove it wont? does anyone have any statistics on that or something? My mom also thinks I'm too young (maybe i am but i really don't care :D) but she thinks I'm too young to do ANYTHING. Also, I can be pretty bad at kissing up and I'm not sure if it would help so any advice on that? And by the way, its not a sign of rebellion or anything like that, as far as I know my parents don't think I'm rebelling or anything but I don't want them too. SORRY ITS LONG thank you if you answer