Kyra Valdire
You don't need to be studying a field to introspect, and dig deeper into your memories to discover the
whys about yourself. You mention wanting to do something different with your hair, and earlier you've mentioned piercings, are you trying to mark yourself as unique, an individual? Or did you mean something different from the way
you'd been doing your hair, and not mean your statement to include the nearby society at all?
Because someone has unnaturally colored hair or piercings does not necessarily mean they are trying to separate themselves from general society or to identify with a certain subculture. Sure, these things are aspects of various subcultures, but having one or two of the things "required" for that subculture doesn't automatically make you a member. For example, liking black and macabre things like bats and spiders doesn't automatically make you a goth, even though those are traditional "markers" of a goth.
There is no such thing as doing something to make yourself "unique", because it's all been done before. No one is more of an individual or unique snowflake than anyone else. You can't pierce your lip and say "Look! I'm totally unique and special now!" when there are thousands upon thousands of other people with the exact same thing.
I color my hair purple for several reasons. Initially, I did it with a friend who was unsure if she wanted her hair turquoise. She was waffling back and forth unsure if she really wanted it, so I told her "I'll do it with you, so you're not alone, and I'll do... purple! Since I like purple." And turns out I really liked it and decided to keep it. I think it flatters me and my personal style and it's not so "crazy" as to be distracting or anything.
I pierce myself because I like the way jewelry looks in certain places. It's also a strange sort of "I don't like this part of myself, so I'll do what it takes to make myself like it." My lip piercings were done with this in mind, at least partially. I hate my mouth, everything about it; my teeth, my lips, my mouth's size, it's shape, absolutely everything I hate. So, I decided to get a traditional labret to MAKE myself like it, I changed it in a way I thought would make it better, at least to my eyes. I got the Dahlia set done with the same intention, and it actually worked out really well because they give the illusion that my mouth is wider than it actually is, which is cool.
It's hard to explain really deeply why anyone likes something, other than "I like the way it looks/I like the way it makes me feel/I just think it's cool to look at/whatever." Beyond that, why do you need any more explanation?