My mom asked me if i am sexually active

Bri

So I am 21..a senior in college. Been dating someone for about a year. First of all, she doesnt know i have a boyfriend. Second, she doesn't know I have been living with him. Third, she doesnt know i am having sex and last night she asked me if I ever had sex and if I was saving myself for marriage. I lied about it all. I feel bad but also I feel like it isn't her business ? She's very judgmental and close minded to that kind of stuff..presses her catholic beliefs on me. Anyone been through this ?

:/ It is shitty because I'm hiding SO much from her..but I feel like I have to hide it from her.