It means don't give up and just keep riding. Not to be a discouraging person, but it will take you a few months to get bike fit and then it will be a lot more fun. At that point you will want it to get easier,, which it never does, you are just able to ride further and maybe a little bit faster.
Edit: The saddles on both of your bikes look horrid to these eyes. You want something that the "sit bones" on your hips are supporting your weight. Padding does not help, fit does. As does time on the bike, even with a proper set up. If you want to be a bike rider, you might want to take what you have to a real bike shop and get their advice.