How did douglas initially feel when he went to the Y.M.C.A. poll . what made him feel comfortable?

When Douglas joined the Y.M.C.A. swimming pool, his fear of water was revived. But he managed to gather his
confidence and, imitating other boys, started to paddle with his water wings. As he started to feel comfortable with two
or three days of effort, a misadventure happened at the pool.