Past continuous and present perfect continuous

-During my childhood I was playing baseball, while my friends played soccer
-When I was going to elementrary school,my friends and I we had a gang
-I met my best friend while, we were in secundary school
-Two years ago while I was working as a waiter, I knowl film director Victor Gaviria
-Lasth montn wile I was walking down the street I found 10,000 weights