Can I go to these countries if I only know English?

Of course, don't worry, English plus gestures, everything is OK. Don't forget, among the foreigners who come to China, only one in a thousand of them understand Chinese. Haven't they lived here? You have to do well and have confidence in yourself. Besides, most people in European countries are highly educated. Your English is trivial. Go boldly. Traveling is a journey of surprises. Everything is arranged so well but it doesn’t matter. So it’s interesting, it’s just a bit adventurous.