I have fine hair. People say that if you shave your head completely, the regrowth will be thicker. Is this tru

I'm 25 years old. Natalie Portman and other actresses shave completely and have no trouble getting good hair back.. I'm of east Indian origin, would my hair grow back just fine? I've always wanted to shave completely, but scared about what people would say. My boyfriend says he'll stand by me. I hope i get thicker hair back.. All u beauty experts, please HELP!!!