I know i should be saying "if a guy really likes you he wont care about your looks" but sometimes for a guy to notice you you need to have the "right" look. One way you could look prettier is wear makeup, you dont need to wear a ton because for most girls 13 year old girls it can be very uncomfortable, but just using a small amount of makeup can change your look compleatly. Im 13 too and for me i wear only a bit.
If you have brown eyes unlike other eyes, do not have an opposite or complementary color. This is because brown is actually a combination of the other colors. In other words, it contains blue, red and yellow. So, technically when it comes to eyeshadow makeup tips for brown eyes, most eye makeup colors work.
If you have blue eyes Sandy taupe and earth tone colors creates a neutral, natural complement – just think of the blue ocean against brown sand. Brown also works well for those with fair skin as it contrasts with the skin color while complementing the eyes.
If you have green eyes when choosing which eyeshadow color is right for you, think of all the amazing contrasts you see in Mother Nature that would look great for wearing on your lids – like rich foliage with brown earth colors, or the colors of succulent fruits in reds and purples.
If your eyes are hazel almost any color that will work with green and brown will work and look just as amazing on hazel eyes as any other brown or green eye.
Hope this helps!! :) And if you want to you could look up makeup and hair tutorials on youtube!