It depends heavily on where you apply. Research-heavy MD programs, especially the top-ranked ones, essentially expect research experience. Many DO schools and mission-driven or primary-care-focused MD schools care far more about clinical exposure and service to their communities.
If research interests you, join a lab long enough to actually contribute and understand the work. A poster or publication is a nice bonus, not a requirement, and committees can tell the difference between someone who did real research and someone who padded a resume with a title. If research genuinely is not your thing, do not force it. Build a strong clinical and service story instead, and apply to schools whose mission matches what you bring.