" i USED TO ride a bike everyday after school and never had any pain."
So when was that?
I commute by bicycle longer than that just about EVERY day, and even I feel some tenderness after the 1st ride if I'm off the bike for a week or so.
If your regular riding was farther away than that, it's no wonder that you're sore.
The spots on your pelvis that are actually carrying your weight - the sit bones - aren't big, about the size of your thumbprint on each side. They will need some time to get used to riding if you haven't been doing it regularly, even if you have a saddle and bike that's a good fit.
The inner thigh pain sounds like it'd be more from chafing than pressure. Best cure for chafing is to use cycling thighs or cycling underpants. To be worn DIRECTLY against the skin. And should be a snug fit.
This MIGHT help with the pressure soreness too, as cycling specific pants/tights are specially designed not to put any seams directly between the skin and the saddle.
Your options now are limited.
- get some cycling tights
- make sure that you have the right saddle height
- see if you can borrow a bike with a more forward lean to shift some weight off your butt onto your arms
. ride in a higher gear to carry more weight through your legs
Before doing anything, inspect your skin closely. Only a mild redness, you can try the ride if it's important enough to stand the pain for.
If you're actually developing sores, skin weeping, scabs, blisters etc, don't ride. It'll take far longer to heal from that stage, and you can easily get nasty infections.