Thrush stigma

I’m 16 sexually active and I started feeling itchy and sore (thrush symptoms) after a course of antibiotics I went to the doctors today and they shone a torch into me and said it looks like thrush prescribed me a pessery and cream and off I went, I mentioned it to my sister and she told me it’s a trampy thing to get and it’s a std and my boyfriend will have it now ( he hasn’t had any symptoms) she said I’m going to get a reputation for passing things around ????