With the posture you have set up on the bike, I wonder if you would be better off with a "Hybrid" bike instead of a road bike. If you really want to stick with the road bike, then perhaps you should invest a little time & money to get a fitting at your LBS. Aside from that, with time in the saddle and increased core strength you will eventually begin to feel more comfortable.... but a good fitting goes a long way toward accomplishing this.