My answer would be that this is a typical feeling for woman (we are perfectionist and very harsh judges for ourselves); you think everybody else knows more than you do or has more experience than you. This may not be necessarily true of ALL your classmates, but it may make you feel better if you find some experience by having internships during the summer or a part-time job. But don't overload yourself too much so that you still have time to study! Many males mess up in their work too, and that's just normal, part of the road to learning. Don't be afraid to make mistakes. Yes, if a woman makes a mistake some (not very smart people) might want to generalize and stereotype saying, you see, she messed up because she's a female. Don't listen to this, except for proving them wrong. But sometimes, nobody criticizes us; it's all in our minds. So be secure and you'll be accepted. You have to accept yourself first, before others do.
You have the interest of learning (that's important and very positive), and you have the will, but you have to forgive yourself. Don't feel devastated. Most guys make many mistakes, and then laugh at themselves. Just get up and go on. Keep your head high and remember that when you succeed (and you will) you will also be easier to remember amongst a crowd of male engineers.