Focus on your own growth rather than comparing it with someone else’s. There will be many people swimming alongside you and some might be your colleagues.
But if you think of your progress as a failure because you didn’t match them then it is a wrong idea. You aren’t here for training to get best in the world. You are here to enjoy the swimming, the happiness it brings and blissful effect it has on your body and mind.
Everyone is at some different level – some are beginner like you and some are advanced like others and so if you compare yourself then you will seem to fall short. But their goals are different from them. They might be training for an event – they want to get best in their area.
Whatever it is don’t let it distract you. Goal no. 1 for you is to improve little bit every week and that’s it. Be happy and measure your progress against yourself. Now go get swimming.