>>146429760 km is a lot for someone who hasn't ridden at all before.
Does your weight rest on your sit bones while in saddle? It should on a normal saddle, on short nosed TT saddles it's more on pubic rami but still bones and not soft tissue. Second is to look at your saddle. Is it big and soft? If it is that's your problem. It may seem counterintuitive but big soft saddles are uncomfortable over long rides. They chafe and your weight is supported by soft tissue and not your sit bones as on a harder saddle. And saddles are very personal. What fits your friend perfectly can well cause total agony to you. The only solution is trial and error until you find something that fits you. Having a good bike shop helps the process. I'd recommend you go to a bike shop, if you can find one that is open now. Preferably one that sells mostly road bikes and ask for help. They should measure your ass and you should take note of that number. And then just get trying saddles. Seat position also matters a lot.
Also for new riders there can be pain during or after rides before your ass gets used to saddle even on a perfectly fitting saddle. That goes away after few weeks. That pain should only be on the contact points though. What you're looking to avoid is any sort of numbness or pain on soft tissue.
