You'll notice that I do call them "saddles," not "seats." There is a reason for this. A seat is something you sit on, and is designed to bear essentially your entire weight. Recumbent bicycles have seats, but conventional upright bicycles have saddles. A saddle is intended to carry some, but not all of your weight. The rest of your weight is mainly carried by your legs, and some by your hands and arms.
Go to a bike shop that has a device or some way of measuring your sit bones (ie. the distance between them.) They're the two hard bits that should be contacting your saddle when you ride. The shop I went to had this bench with a gel layer so you could see where your sit bones were pressing down.
I used to think all saddles were uncomfortable until I realized I have a relatively wide distance between my sit bones. I bought a proper saddle for my ass and now I'm comfy all the time.
Recumbent bikes solve this issue, and they're also way more aerodynamic. Downside is that they aren't as good from a safety perspective (on an empty road they'd probably be more safe, but alas).
If your bike saddle hurts, you probably have a bad fit and possibly a shitty saddle. Brooks is a good brand, B17 is a popular and comfortable choice. You can also get padded shorts and whatnot, but I never bothered using them.
You'll also want to keep in mind that it'll take some time to condition yourself to bike riding, it gets easier and more comfortable the more you ride. Eventually you can end up covering way more distance thank you thought you could and it will seem like nothing compared to what you were previously capable of.
Sometimes, I'd wear them under my regular clothes and then swap them in the bathroom when I commuted to work. Always felt like walking in with a sweaty diaper.
A comfortable (well padded) bicycle seat becomes a lot less comfortable after you’ve been sitting on it for several hours. Like, painful, and possibly dangerous.
An uncomfortable (only contacts your sit bones) saddle stays pretty much the same if it fits you right.
They make comfortable seats, but you’re not supposed to sit on them for very long.
That being said, no bike seat is comfortable after 11 hours on it…
This is why I’m a fan of bikes that seat you on your chest with your head turned upward to see ahead. Bonus, any head-on collision will instantly kill you.
I feel like a proper Omafiets has a perfectly fine saddle. It's the bikes made for sports, rather than transportation, that have the painful saddles, because supposedly you can't perform if you're not suffering.
There's still a period where you're breaking in your sit bones.
When I got my omafiets a couple years ago my ass was pretty sore for at least a month with daily riding. You aren't really putting any weight on your arms or legs so your saddle is doing the heavy lifting.