I'm afraid of living in the United States...qwq

Ok, it should be noted that I am Cuban, and my first language is not English, it is Spanish, I always wanted to travel to the United States, and now that the opportunity has presented itself to me, I am SCARED, I will have to leave my little dog here, because we cannot take her yet, I study English, but, I AM NERVOUS, now that I have more knowledge about the country, I realized that it is dangerous, and much more complicated than in my native country, but, I need advice, people who have had to move to the United States and it was complicated for them, would you help me understand how to act there? I feel that it is different, and you would help me a lot!! 🐱