The Topstone is a nice bike. Unless you have a deformity or injury there's no reason you should not be able to become comfortable/ adapt to it. Your bars are level with your saddle, a very upright position for a drop bar bike. I am your age and hampered by at least 15lbs of extra gut. I'm comfortable with several inches of saddle to bar drop. Unless it actually hurts to ride it you may want to persevere awhile. Not saying that's the best way forward, just an option.