Nope, you should be able to stand over your top tube without touching it, ideally. The seat height is set for efficiency when pedalling, not so you can touch the ground when standing. You'll be pedalling an hour for every minute you're standing, so it makes sense to set the seat height for maximum efficiency and minimum wear and tear on your knees. If you need to stop, you slide off the front of the saddle and stand over the top tube.