Amy Poehler is an excellent role model for many girls and women, she has an inspirational youtube channel Smart Girls: http://www.youtube.com/user/smartgirls/videos
The Ask Amy videos are where she gives great advice and you can write in questions. This one is just one of many and speaks to me, hope other people find it useful too. She talks about “the only way to know you’re good at anything, should be with someone, are in the right place, like or don’t like something, is if you do it. You can think about it and guess what the outcomes might be but you will never know until you try and if you fail – then you know more about yourself.”
So have the courage to try if it’s something you’re interested in, don’t let fear stop you.