So I'm an 18 yr old college student and I'm home for the weekend. Obviously, I don't have a lot of opportunity to jerk off at my dorm, so when I'm home I take advantage. And my dad is always knocking at my door in such an annoying way. And over this past year, when my door is locked and I take a long time to answer it he thinks I'm like hiding something, and has since hinted or suggested that I was drinking or doing drugs behind the closed door. Anyway, today I was really horny since I hadn't jerked off in like 2 weeks. I was in my room having a really good jerk off (like really good) and my dad started knocking at the door. And he was really persistent this time as the rest of the family was out of the house. I wasn't going to answer and I wasn't going to stop jerking off because I didn't want to finish early and it was really good, so I ignored him. Then I heard him get the key to unlock the door while I was in mid-jerk, and I got really pissed. I just walked over and angrily opened the door completely erect telling him I was trying to jerk off. And he saw the harcore porn in the background. He laughed and seemed impressed by the porn and checked it out for like 5 seconds. I told him to give me like 2 minutes and he said ok. And I shut the door, and now I'm so embarrassed and regret how it went down. I walked in on him watching porn before this happened and he covered my eyes and changed the channel. I don't know what to do because he always treated me like a baby, and now, it seems as if he sees me more like a man now, so I don't know how what to say to him or how open I can now be, and on top of that I'm morbidly embarrassed but surprisingly feeling empowered. What do I do?