What does it feel like for boys to eat estrogen? Do they think they are women?

It is a kind of cognition to think that you are a woman. The so-called cognition refers to the acquisition of knowledge through psychological activities (such as forming concepts, perception, judgment or imagination). Your problem stems from the physical level. When men eat estrogen, it will affect the secretion of androgen, so it will affect the secretion of androgen to maintain the secondary sexual characteristics of human body, so the secondary sexual characteristics of women may appear, and even the secondary sexual characteristics of men will fade (in the case of taking too much).