Parents set up cameras outside the house

I was home alone for a whole entire week. Mind you, I’m 20 years old attending university so I’m out here with NEEDS. One night I left for a few hours to see a guy. Half an hour of not being home , I got bombarded with calls from my mom asking where I was. When I got home I told her that i was home the whole time. (Bad lie , I know). She said that she got a notification that I left the house and only got home when I called her. I didn’t take her seriously because I thought that’s a mother’s intuition.

Then, I had a mini get together with friends that contained 6 people. My parents only knew 4 people was coming. Eventually, it raised their suspicion that there was more than 6 people in my house. My brother was the one questioning at this point. For some reason, he knows there was more than 4 people.

So now I’m really curious because in a week, I did a lot of bad things.

I snuck in 2 different guys. Guy 1) stayed the night and didn’t leave until the next afternoon. Guy 2) came over late at night, stayed for 2 hours ish, then left.

I confronted my mom about it and she said there are cameras around the house.

I don’t know if they’re bluffing to catch me in a lie , or if they already know I’m lying.

What do I do ?