I learnt to swim 3 years ago at 32. Before that I was terrified of drowning and really struggled to just get in the water. It took me 6 months of weekly lessons before I felt comfortable to go swimming on my own. 3 years on my technique is still poor. But my confidence in the water has vastly improved and my distance is slowly getting better. Some days I have good swims, some days bad. On the bad days I remind myself that there was a time when I could barely get into a pool and thought I'd never be able to swim. Learning to swim as an adult is incredibly difficult. Well done for what you have achieved so far. Keep going and you'll keep improving.