I'm female and I studied mechatronics engineering and computer science at University from 2007 - 2013. There were 5 girls in my course, out of 50. So mechatronics engineering is not only for boys, and girls can do it, too! In 2008 I founded Robogals. We go out to schools and teach girls how to build and program robots, to show girls that they can be engineers too. Robogals has now taught over 17,000 girls robotics workshops and is in Australia, UK, USA and Japan. Let me know if you would be interested in bringing it to Peru!
Tell them that regardless of what they say, you are going to be an engineer. You are going to show them that it can be done. Good luck with your studies!