Discouraged from several interviews w/o getting internships

So here is where I am at. I am feeling really discouraged and under motivated to continue my job search.

A little background is that I am an EE with a 3.5 overall GPA (my major coursework is like a 3.2). Once I went to university, I was working in semi-related fields throughout my schooling. One thing to note I did not do very much on campus projects or organizations because I was working and trying to get through my classes. (not much support from parents except for housing). One job was retail selling electronic parts, and the other was sort of a technician/engineering job at a very small firm.

I work at a company now where I am an electronic technician working in maintenance. When anything electronic breaks, or they have questions relating to new devices, I am there to provide solutions. I also have an opportunity there to redesign some of their rectifiers (true Engineering work), however it's a task that i don't know if I can realistically do over a summer.

I did receive a job offer for after my graduation this fall, but it was kinda on the low side as far as pay. I will go there if nothing else, but I still want to try for other places to see if I can get anything better.

The thing is, not to put my previous employers down, but they are not anything like Fortune 500 companies. And I'm getting a little discouraged because no other places made me an offer, and I have applied to many. Places like Boeing, Northrup, Harris, Raytheon, Edison, and many more. Got an interview for some, ignored by the rest.

It is summer now, and I don't have an "internship". I really don't know what to do. A lot of my fellow students have gotten jobs or internships at some of the good private companies that I applied to also. I'm left here still in kinda the same jobs as I have always been. Bottom of the barrel, very low benefit jobs/opportunity jobs. And I'm really discouraged. I honestly don't think I'll be able to improve anymore to where other companies will like me.

I am honestly tired of this job search. I feel there is so much ego, greed, and shallowness in the corporate world. I've been told by countless recruiters that "resume looks good, I'll pass it on" to hear nothing back. I'm at the point where I won't even let them keep my resume unless they tell me they want to have an interview with me.

I worked my ass off in college. I didn't screw around. I'm respectable and I work very very hard at my school and jobs. I really don't know what to do anymore. I already use my free time to do more studying and learning.

What the hell is wrong with me? What am I doing wrong? Do I lack the necessary skills? Do I lack social skills? What?

Tl;dr: 3.5 GPA EE student rejected from multiple companies for internships. Lost and doesn't know what is wrong with him.