Really need help from someone who did mechancial engineering internships

<p>My major is Mech. Engr. and I am on the sophomore. I have been told many times internships are the most important things for your resume.</p>

<p>The thing is:can you fail your internships if you are not good enough?I am not good at AutoCad,so does that mean I will not be able to keep it?I just need some ideas on what you do and what goes on.</p>

<p>Thanks.</p>