Is It Weird ?

So my mom has a new bf they have been dating for a few weeks and he has 4 kids . one of them is 14 my age and hes very attractive. so we get to know  each other better. one night he slept in the same bed as me and his sister , we kissed that night. another night we were alone in the same room and he was the first guy i let finger me. then another night we were in the living room no one was there and i lost my virginity to him that night . the next day his siblings find out everything. long story short all the siblings gained up on me and "he" texted me saying to forget about him and to forget that we ever did anything. so i regret losing it to him! is it weird that i lost it to my kinda step brother ?