I had 5 polyps removed. Is that a lot? Should I be worried about future ones?

Yes you should have . I assume these polyps were located in the large intestine. If that is the case you are advised follow up colonoscopy to look for additional polyps for which you are at increased risk. Your doctor should have advised you about the future follow ups which typically are advised every 3-5 years once you have had polyps removed. But do check with the doctor who has removed your polyps as to future guid.