Parents "pressuring" me to call the hospital I went to get tested for STDs.

I'm 18.

My mom is asian (my dad is white) and she always wants to know what the hell I'm doing. She opened the mail that was under my name and went bullistic thinking I was pregnant because I had a lab test that costs $496 (still fixing that btw I shouldn't have been billed!!).

Both don't know I'm sexually active. My mom probably knows because she found birth control pills and condoms in my tampon pouch. I don't want them to know about it because if they ask who I'm having sex with they won't be happy (I'm 18, had sex with a 24yr old). 🤷🏻‍♀️ they dont even like the idea of me seeing a 24 yr old..

Advice pls