Why do people think I come from a wealthy family?

At school people ask me if i'm spoiled, "rich", what my parents do for a living, etc. Quite often and when I ask them why, they say they believe I'm "rich".
My hair is long and copper brown with my "bangs" to the side (they're extremely long for bangs), I wear ray ban glasses (like prescription not sunglasses, i do have a pair though) and as for clothes, cardigans, t shirts, sweaters, usually black or boyfriend jeans, skirts, hoodies, etc. Shoes; vans, converse, some oxfords and I have 4 pairs of doc martens. I don't wear accessories often, if I do its usually a bracelet/watch. I have a herschel backpack and I bring my lunch to school everyday (I don't know what that has to do with it but w/e), I make good grades, usually high a's but the occasional b. I have an iphone 5s.
I enjoy art and such.
My dad makes a good amount of money I guess for being a single father and all of my friends know he is.
I don't think its bad that they think this, but why? I think I'd but categorized as upper middle class, I go to public school, but I'm not wealthy.

Doc martens are HELLA expensive lmao. I think you know why people think you come from a wealthy family…