Hi, Shebiker!
Welcome back to cycling! I just started riding myself last Fall, and I know exactly the pain you're having.
The advice above is all really good, and I ditto it. I could not BELIEVE what a difference it made when I got a good padded biking short (with a real chamois, not just a thin foam layer like some have) and started using chamois butter. Good biking clothes are not cheap, but are worth every penny in terms of comfort riding.
Making sure the bike fits you and getting the right saddle, as said above, are also crucial. Any good bike shop can help you with that. I've tried several saddles and am still working on that issue, but am getting closer to the right one each time. And, unfortunately, you really do just have to develop 'callouses' in certain places as your body gets used to it. I HIGHLY recommend a rest day with no biking between cycling days until you have them developed. If you try to just 'tough it out' when it's really hurting, you can actually cause blisters and/or small tears on sensitive tissue. I speak from painful experience here, and it's not fun, lol.
So get the biking short, get the chamois butter, get the bike fit to you, and keep trying saddles until you can enjoy the rides. It takes a bit of time, but it's worth it!
Good luck.