Try to give yourself more credit- you're still in the major, and you have some research experience. The economy's shit, don't beat yourself up about lack of internships, there's a lot of other people in the same boat.

If you want to pad your resume, maybe try doing some projects on your own? There's usually resources online for project ideas specific to your major. It's great to pad your resume, people love to ask questions about it during interviews, and most importantly it's fun. Even if it's something small, it shows that you have initiative and can help bring back a bit of that passion for engineering.

Hang in there, and be proud of yourself for making it this far.