It's your choice, but there's nothing wrong with dressing like 'a girl' from time to another. My guess is that anda don't like wearing a lot of make up either? But if anda really want to look lebih girlish, I can help you. First, anda need to do your hair (I don't know what your hair looks like, so I can't really give anda advice).
Then anda can start wearing heels. Start with the low ones (6,5-7cm) and then, when anda can walk straight in them, change to high heels (10-12cm). That will make anda lebih feminine, and boys will be all over anda (trust me).
anda also need to have a lebih feminine style. That means no baggy pants and no comfortable clothes. At summer (this really depends where anda live) anda can wear a nice, but simple summerdress. To buy new clothes, anda need to know what season anda are, and what body shape you've got.
link is a really helpful site.
If anda don't like dresses, anda can always wear short skirts atau shorts. There's a lot of things anda need to know if anda wanna follow the fashion, so my saran is finding your own style first, and then mix your style with what's trendy.
My last saran 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 anda like her atau 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. anda 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.
