please help

i think i was taken advantage of by a tantra instructor. i was getting a colon cleansing and the doctor said he also taught tantra. he also told me that he felt i had very strong spiritual powers and he wanted to see me again and "talk." i was just curious so i met up with him again. we talked in his office for a bit. he was telling me about tantra and he asked if i wanted to try it. i said okay not knowing what to expect. we went into a small, dimly lit room with a massage table. he told me to remove my clothes and lie down. he started playing with me and asking me if it felt good. then he mounted me and started having sex with me. i know i could have gotten up and left but i was so shocked and confused. i just feel like a tantra teacher shouldnt have sex with a person who doesnt know anything about tantra especially the first day they meet. i know i have responsibility in this too because i could have said no thanks i dont want to try it, but when someone says you have spiritual powers it makes you curiuos. i feel like i was raped in a certain way. i am so upset and everytime time i think about this i want to cry. what do you think? thank you so much for listening!