I am currently a junior and college and am working on my resume. I currently have 4 different projects (related to my major) on my resume (class final projects, directed research, etc.). However, I have only had a single internship. Currently I have listed a summer job from before I started college on my resume, as well as several years of selling on eBay (several years as a top rated powerseller) (my college career advisor suggested adding this freshman year). Once I updated my resume to reflect projects for this semester, I found that my resume is over one page long, which I have been told isn't good for a college student. Should I take off the summer job and eBay selling experience?
EDIT: I also have a short section for accomplishments on my resume that includes a book I authored that has been published (not an academic work) as well as being Bloomberg Certified in Equity. In my opinion these are both things not directly relevant to a potential job, but are things I'd like to keep on my resume. Should I leave both on?