Your doing so well Kristal I wish I had your will power.
As for the bike seat it does get easier
The first bike we bought the seat was really horrible (I'm glad the computer in it died and we were able to get another bike) we chose one that had a gel seat LOL so it's a lot more comfy but still it hurt for a while. Is the seat on your bike a normal sized bike seat ?? You can buy gel pads for normal bike seats from Big W, I noticed them there the other day.
Don't stress about tomorrow your doing so well. And remember that even if the scales don't say a loss check with a tape measure
With all the walking and riding you have done I bet its doing a good job toning you up