It's your choice, but there's nothing wrong with dressing like 'a girl' from time to another. My guess is that آپ don't like wearing a lot of make up either? But if آپ really want to look مزید girlish, I can help you. First, آپ need to do your hair (I don't know what your hair looks like, so I can't really give آپ advice).
Then آپ can start wearing heels. Start with the low ones (6,5-7cm) and then, when آپ can walk straight in them, change to high heels (10-12cm). That will make آپ مزید feminine, and boys will be all over آپ (trust me).
آپ also need to have a مزید feminine style. That means no baggy pants and no comfortable clothes. At summer (this really depends where آپ live) آپ can wear a nice, but simple summerdress. To buy new clothes, آپ need to know what season آپ are, and what body shape you've got.
link is a really helpful site.
If آپ don't like dresses, آپ can always wear short skirts یا shorts. There's a lot of things آپ need to know if آپ wanna follow the fashion, so my advice is finding your own style first, and then mix your style with what's trendy.
My last advice is to find a role model. Mine is Kate Moss, she is THE guru of what's hot. Just look at the picture. She is actually wearing rubber boots, shorts and a vest. But she still does manage to look fabulous! Another one is Miley Cyrus (whether آپ like her یا not, she's got an amazing style).
EDIT: Oh, and I forgot the most important thing: Accessories. Match them, but avoid mathcing them with your clothes. آپ could for example wear a simple white summer dress with a brown belt, brown pumps and a brown bag. That's a simple and cheap combination.
