Yes, same advice as Machka, go get a new saddle now. It probably won't be your last one, either. It's not your butt, it's the saddle and possibly bike position. Bend over and stick your hand down through your crotch and push up hard on your butt right about where you think your hips are. You'll find two bony protrusions called ischial tuberosities. When you are sitting on the saddle properly, these are the main points of contact. You definitely do not want the tissues between these points supporting your weight.

Even if your saddle is perfect and supports your weight in the right spot, it takes a bit of getting used to. What happens is that sitting on your ischial tuberosities compresses the tissue that covers them. This reduces the blood flow to that tissue, which one perceives as pain. After conditioning, that tissue becomes used to the reduced blood flow and stops hurting. This conditioning shouldn't take more than a couple of weeks to begin with, and continues to improve to allow longer saddle times.

If you feel numbness between your legs, that's not what I'm talking about, and that won't go away with conditioning, but will only get worse. That's a saddle or saddle adjustment problem. Don't let that continue.

You want surprisingly little padding on a saddle. Less is generally better than more, because less padding concentrates the weight in a smaller area. Thus less of you is touching the saddle, and less of you is subject to friction, cutting off of blood flow, etc.

Besides the Brooks that Machka suggests, you might try a Specialized Avatar, which comes in different widths. Your bike shop will measure your butt to find the right width.