Step 1: your seat shouldn't touch your taint, so clearly you don't have a good seat
Step 2: since you're not on your sit-bones, get a chamois shorts. Mtn bike ones don't look like bike shorts. Or wear gym shorts over bike shorts. Or get a liner style. I've been known to to any of the above while commuting.
step 3: increase gradually
Step 4: cream
Our new motto "There are no winners here." - Pat