I'm graduating engineering program in only six semesters but have gotten no serious work experience along the way. How much will grad schools care?
The lack of professional or industrial experience will likely not significantly influence graduate admissions committees, particularly if you're planning to apply outside of your undergraduate field. However, what will matter is that you don't mention any real research experience that you've acquired in any field, whether your own or another. When applying outside your "home" area, this will almost certainly raise alarm bells for committees, because they will have little solid ground to decide whether you will succeed in their program or not. (For instance, they may have a hard time deciding if you can successfully complete the coursework phase of their program, and they may not be able to tell if you will be able to become a competent researcher in that program, if research is part of the degree.)