You asked a question about a very important area. I do not think that you will find any obstacles more difficult that the courses that you will take in college. You will find that companies hire people based on their ability to help their organizations.
Here is a site that you will find interesting, as it is aimed at girls like you who are interested in engineering: http://www.engineergirl.org/
This site is for an organization that represents women in engineering: http://www.ieee.org/membership_services/membership/women/index.html
A good way to learn more is to talk to your school counselor about becoming involved in coop, intern, shadowing, and volunteer programs that will allow you to become more aware of what engineering is all about.
Here is a good site for locating internships: http://www.fastweb.com/
Also, talk to the head of alumni relations at your school about meeting and talking to graduates of your school who have become engineers. The job of this person is to create and maintain a community of graduates, so he/she would be able and very happy to enable you to talk to graduates, so you can see what they are doing, how they got there, and how you feel about what they are doing.
Here are two sites that will help you to get helpful information and form relationships that will be very helpful: http://www.wikihow.com/Network https://www.themuse.com/advice/nonawkward-ways-to-start-and-end-networking-conversations
Best of luck. Please keep me informed. I would like to follow your progress.