>>1861795You're not supporting your weight correctly by being a strong rider. To be comfortable on a road bike you basically have to be always putting down power, smoothly. That's what supports you.
If you're riding hard enough you'll actually pull up on the bars rather than bearing down on them and there will be very little weight on the saddle.
The flipside of this is that if you're straining, if you're not on top of a gear or if you're throwing around the front end, it's very easy to injure yourself that way too. It's about being strong but also smooth and relaxed. You should have a very loose grip on the bars.
An RB-2 is kinda a sport touring bike though, and you should be able to set it up to be much more comfortable now than it is for you, and to facilitate some fatty coasting and cruisey things.
You actually do have a not insignificant amount of bar drop. A good way to fit a bike is to pick one your balls rest on but don't annihilate to get the highest front end possible. You're probably a size down from that.
That pearl/dymanic (?) has some rise, quite a lot for a 'real' road stem, but not a lot really. I imagine you'd probably like having zero bar drop and that bike might still handle well. You want a tall technomic or dirt drop, or, to experiment cheaply, a threadless adapter and 31.8-26 shim.
Those noname tires are probably also shooting you in the foot. Nice tires give a significant amount of ride comfort compared to cheapies.
And padded saddles don't work.