Hello Paul, 

Thank you for your homework.  It’s great to hear that even though you bought things without planning, those moments have become some of your happiest memories. I believe many people can relate to that feeling. It’s good that you can reflect on your experiences. In your future assignments, try to share more about how those purchases made you feel or what you learned from them. This will add more depth to your writing. Overall, you are doing well, and I encourage you to keep improving your writing skills. 

~Teacher Cathy 

When I was a young living with my parent, I didn't have to worry about either making or saving money.  

>>When I was young and lived with my parents, I didn't have to worry about making or saving money. 

At that time I was very careless enough that I bought so many things without planning at all.  

>>CORRECT 

OR>>Back then, I was so careless that I bought a lot of things without any planning. 

But this is one of my happiest memory ever. 

>>But this is one of my happiest memories ever.