Ake left Chelsea last summer.
"That's what I needed to develop; to learn, to make mistakes and to grow as a player and that's what I think I am doing," he told the London Evening Standard.
"I said that before the transfer that I always put pressure on myself and don't feel extra pressure because of the money. I always want to perform. So I don't feel pressure.
"Of course you want to perform, and you have to perform but the more you play, the more comfortable you feel. I always put pressure on myself but not extra pressure."
He added: "Sometimes [I can improve] my positioning. On the ball I've improved a lot, but defensively there are still a few areas I can improve and that's what I'm working on.
"He [Eddie Howe] is a really good manager, a really good coach. He really likes to coach players every day in training and make people better - trying to help people.
"I think that's what he is doing. And that's also the big reason why I came back, for him."