AIO for feeling really disturbed for roommate masturbating while I was in room?

Background: I haven’t told anyone else this because I don’t want to embarrass her, and I know I’m posting this online but the only reason I downloaded this app was for some piercing questions and nothing on here could be linked back to me so basically no one here could find out who I am or who she is. So I am asking anonymously as to not embarrass her, which is why I’m not asking anyone I know.

I’m a freshman in college which means I live in a two person shared dorm, beds about 15 feet apart. I got up to pee this morning at about 6:40 and couldn’t go back to sleep so I scrolled on my phone, but about 7 I hear vibrating, look over and see her legs up (under the covers) and I know the sound and position of someone masturbating. Well 15 minutes go by and my alarm goes off and she’s still at it… so I snooze it and pretend I’m going back to sleep. It’s 7:40 now and I have to get up for class, well while I’m getting ready she IS STILL AT IT!!!! I mean come one, first of all WHY SO LONG, second of all WHY WITH ME IN THE ROOM!! I don’t know I am feeling so creeped out right now. Is this stupid to feel this way. She didn’t even stop as I was getting ready, like she kept going fully knowing I was awake. The lights were off and I was trying to be as quiet as possible to keep up the “oh she’s just sleeping act” but she knows I have class every Tuesday and Thursday 8:30-9:30 so she literally could have just waited until I was gone… we also have a private bathroom with a shower she could have used like idk… for some privacy? she’s my best friend and we clicked after meeting for the first time in person 2 months ago when we first moved in but we met online back in March. So it’s not even like a long term friendship where we’re super comfortable with each other and have been for years. I mean is this a normal hormonal college thing like I don’t know I’m just being old school and judgy. I don’t know… can you guys tell me if I’m overreacting to still feel kind of like… violated I guess is the best word to describe. It’s totally ruined my day and my perspective on her because I would never think to do something that intimate in a room with another person, let alone knowing they’re awake.