My aunt is in England and wants to help me apply, but the visa for studying abroad is too difficult. I want to visit my relatives.

In your case, the tendency of emigration is very high. I don't think it's easy. Because according to your procedure, China people can immigrate as long as one person from each family goes.

Visiting relatives must be immediate family members, and you are an adopted son who will admit nothing. And our country has its own parents, there is no reason to give up custody directly and let you be your aunt's "pro" child.

So I can only study abroad. You can't sign a visit visa. Moreover, when we apply for a study visa, we usually train them. It is best not to mention that relatives are abroad (unless they are visible in biological files), because this will increase the tendency of immigration and the probability of visa refusal.