Mom walked in

So my mom walked in on us . I don’t think she assumed if we were doing it . She asked if it was the beginning or the end of it and I told her the beginning and it didn’t get that far . I’m so mortified I can’t even think straight. I feel so bad for her that she walked in on us . My mom will never trust me again . Yes I’m a senior in highschool and I live under her roof . I’m pretty sure she’s not going to talk to me until I graduate. I just want to leave and not look back . My family is very strict on that so I know she’s probably mortified as well . I feel so bad . I just don’t know what to do .