Hi, Welcome to Bike Forums (BF) !
Nice looking bike !
Looks like the seat position is nicely set for a rider who has been riding consistently for some time, but could be adjusted to better accommodate someone who hasn't ridden much.
There are a number of other issues which are contributing to your discomfort.
The jeans... jeans in general are often stiff, and many jeans are cut for 'fashion' and therefore quite 'snug'. They tend to restrict movement of the leg and especially the leg, hip and butt muscles.
I would suggest wearing loose pants or shorts - the thing about cycling shorts is not just the padding, but the snug fit of lycra which also gives nicely for freedom of movement, good circulation and comfort.
BUT, you don;t have to use bike shorts. Nice, looser fitting pants or shorts will work fine for most riders. Like gym pants... But loose... 'Yoga' pants tend to be heavier fabric and again, somewhat restrictive.
Your seat height - you can try dropping the seat 1/4 to 1/2 inch, for that period of time that you become accustomed to riding and start building more frequent riding time and miles...
We had to do that for my spouse, who has quite recently become a regular rider after many decades off the bike.
Her fitness is slowly returning and improving.
She also need a saddle with more cushion than the stock saddle which came on the bike.
If you purchased bike from a local dealer, maybe go and ask if they have a saddle with more cushion which they can loan you for some time, as you build your riding...

The bad news... The 'hurt' is super common for most new and returning riders who have not ridden for some extended time - most new riders...
You're putting the majority of your weight on the saddle, at two points, the 'sitzbones' - you know where I'm talkin about... LOL!
Most, almost all riders, will experience that in their first few weeks...
To overcome that, you should ride as often as you can, days in a row, and stay with it. The 3-5th days are the worst, then it becomes better....25-30 min rides are a great start !
Do stick with it, in a few weeks the 'hurt' will reduce greatly and eventually not be a problem.
If you decide to change saddles, the ones which are female specific, with cutout or space/channel down the center are often a very nice option.

Welcome to cycling. Most of us have falling totally in Love with riding... and you often meet the friendliest people.
Ride On
Yuri