Need school appropriate shirts? ?

I am a dark clothes person, I'm not gothic but I like reds, greys, blacks purples you know. And I'm very picky I want nice clothes that make me look like a girl not a dyke, all I have to wear is T-shirts. I want things that I can wear to school, meaning it has to have sleeves like a tshirt but maybe nice. I'm just tired of having to dress like a lesbian. Lol can anyone help or even know what I'm talking about?