The midfielder has battled for consistency since his summer arrival from Bayer Leverkusen.
"To be honest, it's very tough. It's a big change," Havertz told Sky Sports. "It's very hard because you play every three days and the intensity here is much more than in Germany, to be honest.
"Of course it's a big change for us but for me it always felt good to have Timo (Werner) next to me because we can talk to each other.
"We were both in very difficult situations. He was also unlucky this season. But I think right now, for two or three months, we both play very well and I hope we can continue like that."
He continued: "When you come to London you want to live the life here but in the last few months, it was not possible.
"You always had to stay at home and things like that, so we didn't experience much from the city. Only football always. But hopefully next season that will change a little bit and we can experience a little bit more."
Havertz concluded: "I know it was a tough season for me, not the best season of me. But I knew before I came it would take some months to adapt to this league, to the country, and since [the last] two or three months I feel very confident. I play well, I score goals, I assist some goals and that is what I want to do."
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