Feel guilty keeping secrets from parents

They are really strict, no boyfriends allowed, no sex before marriage, they are really uptight and awkward to talk to. I still haven't had sex and I am 24 but I recently dated 2 guys and did other stuff with them. I also recently have been kissing and getting intimate with another girl. I feel guilty every time I look my mum in the eye but how can I tell her I am a young girl experimenting. For me as long as I am not harming anyone I don't see how it can be wrong. My mum would be disgusted if she found out. But I feel so guilty :( Should I?

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