Being a first author on a published paper takes a lot of hard work! Most people (except those who are very dedicated to research during the school year) are not able to publish their results, as first author, in a quality peer-reviewed journal during their undergrad years, at least in my experience. You can publish abstracts or do poster presentations, which are good in themselves and shouldn't be slighted - they are a great way to "break into" publishing. Right now (keep in mind I am 25, more than three years out of undergrad) I am publishing a study in the Journal of Infectious Disease and even the review segment of this saga - passing it around to the co-authors for review, then to the lab directors, then to the agency, then to the journal, multiplied three times to take re-writes into consideration, takes quite a while. The work involved in getting the actual paper out is often more time-consuming than the research itself.
This changes if you are not going to be the first author on the paper, as you just focus on the research and let someone else write the thing up. If you can do that, awesome; if the research ends up in a publication, great! But publishing is not the be-all, end-all - not for a pre-med anyway. Learning how to do research is the real prize here, because it will be invaluable on your path to becoming a physician.