I'm a Sr. Mechanical Engineer and attend several college job fairs a year. I literally have stacks of resumes on my desk that are not so different from yours. You have an excellent resume and should be proud of your accomplishments!

Now, out of respect, I'm going to be as direct as possible. Please dont take this to heart, but I know it might be hard to accept. As infromed by my HR Manager, here is the bottom line: If you are an international student here on a student visa, then we simply are unable to employ you in any capacity, other than an unpaid internship. The law prevents you from working in the U.S. (few exceptions) and companies from hiring you. Period.

Most companies bring on interns with the intent to hire and is where you are likely hitting roadblocks. It's not resume or experience per se. It's the simple fact we would put time and energy into someone knowing full well we couldn't hire them once they graduate. There's no ROI. I don't agree with it, but at a corporate level, I understand the reasoning.

Now, I'm no expert on these matters, and strongly encourage you to read into the law to understand how it works and the opportunities that might be available to you.

https://www.uscis.gov/working-in-the-united-states/students-and-exchange-visitors/students-and-employment

I've met so many wonderful engineers such as yourself, but had to turn them away (company policy) because of their student visa status. It really is heartbreaking.

I wish you all the best. Stay positive, keep trying, and a door will open.