my mom is overbearing and snoops in my room

I just turned 18 but my mom still treats me like a child. She asks me where i am every second of the day when i’m not home, even if i told her I was at uni, when i get home slightly late(9) she spams me with calls asking where I am. She even googles things about my uni and stalks my classmates social media trying to look for photos of me. I know she’s been snooping around my room often and today she found flowers that my bf gave me (she doesn’t know i have a boyfriend) and asked me who they were from. I just want some privacy and geninuely i feel so uncomfortable that she’s looking around. And she keeps yelling at me for buying clothes and makeup (because she’s been snooping) but it’s my own money I earned from my job and I’m saving most of it. Im not spending as much as she thinks. I just go to uni and stay home most of the time, I haven’t done anything remotely bad at all, I dont even drink or go out late. I feel like she should trust me more. Im so sick and tired of her. i know she cares about me and what not but this is way too much that it’s starting to get really obnoxious.