Change it. No question. No good comes from riding an uncomfortable seat. But finding a comfortable one is sometimes a long journey. The type of seat you want is dependent on a number of factors, including whether you're male or female, the distance between your ischial tuberosities, whether your posture is upright or racier, etc, etc. I like Brooks B17's and Professionals for my touring bikes and Fizik Ariones for my road bikes. My wife likes her Serfas dual-density with cutout for her town bike, which would make me numb in about 5 minutes. She thinks my seats are azz hatchets. A very personal thing, bike seats.