Mom caught me masturbating --- so much embarrassment..

So, last night I was in the phone with my boyfriend and I was playing with myself, I closed my door and before that I went to say goodnight to my mom. I guess she got up when I went to my room and she like forcefully pushed my door open and shouted "why is your door closed all of the way?" Because I don't normally have it closed, I usually have it pushed up because its hot. But when she asked, on impulse I said "because I'm cold."--- meanwhile we don't have working central air because it broke, and I had two fans on... what a dumb excuse 🤦🏽‍♀️ She didn't say anything, she just closed my door and went back into her room.