It's possible that your lack of experience is coming into play here, but it might also be how you are wording your resume and what information you have one it.
Some general resume tips:
1.) Tailor your resume to the job you are applying for. Make sure you list all the skills you have that are directly applicable to the position.
2.) Use their language from the job posting. If they call something structural engineering and you say strength, you may get kicked out of a keyword search because the person weeding through the hundreds of resumes didn't think to look for that additional word. So stick with the wording they use.
3.) Use power words. Led, managed, organized etc. Don't just say you participated in something. If you were the main person working a task then you led it. Take ownership of that.
4.) Include leadership positions in organizations as well as other relevant opportunities/jobs/projects/research etc. you have had. Anything that can help set you apart for other candidates is always helpful. If you held an officer position in an organization, were a TA, or even special projects you worked on will all help build your case as a qualified applicant that will stand out from the pack.
In terms of other things you can do to help you case, check out your local Society of Women Engineers section. Get involved with people working as engineers and maybe one of them can put in a good word for you at their company.
Also each discipline of engineering has organizations, so it wouldn't hurt to network with the organization that aligns with the kind of engineering job you are trying to get. Networking is key in engineering.
But bottom line, you don't have to work as an engineer to be one. If you have a degree in engineering you're an engineer. You did the work to get the degree, so be proud and own it! Then take that ownership to your resume.
Best of luck on your job hunt!