making a memory

I'm not too old to write about memories, so yesterday, when I was walking with my friends, I felt that I wanted to keep that memory forever and (never let it get old/keep it fresh). I was so happy and grateful for that moment. At that time, I felt that I had lost a lot of happy memories by being sad and angry about bad memories and I had forgotten that I had very happy memories as well. I always say to myself, "live for the moment" - whether I be happy or sad (subjunctive use and a little poetic)/ no matter if I'm happy or sad), because all of my memories make me who I am now.