This is an embarrassing question for me. I don't think it's my sit bone, but I could be wrong. When I go for rides over 20 miles I start to feel really uncomfortable in my groin area. I feel as if I'm not getting enough blood flow there. I try moving around on the seat, sitting further back and lifting off the seat. I'm doing my first TT next weekend and it will be 24 miles. Can any of you more experienced gals out there tell me what may alleviate this?