My 2 cents, since you mentioned it was a gift and you've taken it out a few times only. Have you been to the bike shop for a bike fit, to ensure that the seat height and its horizontal position are best for you, that the stem is long enough and the handlebars wide enough?

As zoom-zoom and wahine mentioned, saddle time toughens your sit bones. Good shorts make life more enjoyable for more saddle hours, too. Congratulations on the new bike and welcome to the dark side...