Mother-in-law issues

Marlee
Alright, so usually if someone asks about my sex life im pretty open about it. But tonight my (soon to be) mother-in-law asked me if I had any STD's that I knew about. I'm so ticked. 
*a little back story*
I've been with 3 guys sexually. All of my exes were virgins when we were together. Sounds horrible that I took 3 guys virginities, not proud of it but let's keep going. My boyfriend knows but obv wouldn't tell his mom that. So instead of him just telling her no I didn't, he asked me. As if I did. I had all 3 rounds of the HPV shot, all the guys I have been with were virgins, none of them ever had cold sores or anything related to and STD/I. 
Why am I so annoyed by this?