Ur dad died? U think to make his dream. How wonderful and cool u are.
American doesn't like Asian. They think they can manage Asian people because many Thai girls follow Farang. It's mean they look down as easy people especially outside US.
They are gentleman inside US.
Try to get green card-it's like a permanent visa for US.if u want to go US. U have to accept hard and nartow way when u can go there. I'm sorry u are already 25 not so young to be succeed by urself.