YOU SAID:

When I was a young boy I liked to swim around really fast

INTO JAPANESE

私が若い頃、私はとても速く泳ぐのが好きでした

BACK INTO ENGLISH

When I was young I liked to swim so fast

INTO JAPANESE

私は若い頃、とても速く泳ぐのが好きでした

BACK INTO ENGLISH

When I was young I liked to swim very fast

INTO JAPANESE

私は若い頃、とても速く泳ぐのが好きでした

BACK INTO ENGLISH

When I was young I liked to swim very fast