Is it wrong to participate with different people in a certain online game and form friendships with them (while staying away from girls), and then join their club (knowing that they are disbelievers), given that the conversation does not involve anything vulgar?

Man is influenced by his friends, and this is why the Prophet, may Allah’s prayers and peace be upon him, said: "A person is upon the religion of his intimate friend, so let each of you look at whom he befriends," and "A person is with whom he loves." Based on this, you should not join them or participate with them in their club.