I feel like I’m at fault

I met a man twice my age online after a few minutes of talking to me he started talking about explicit sexual topics I am 17 and he is 28 I turn 18 in a month and I felt like it would be fine so I went along with it I know this is a bad idea but I’m a very mentally unstable person and I’ve been sexually assaulted before and idk i know I should not have gone along with it but I did I’m sorry he talked to me for hours eventually convincing me to send him explicit images I feel like I’m not able to complain or seek help because I didn’t do anything to stop it and then after talking to him for a while sent him stuff I’m both a minor and very mentally unstable and I feel taken advantage of and feel disgusting but at the same time I feel like it was my fault because I like technically consented it wasn’t even really grooming because I think grooming is like when you manipulate a child after gaining trust with them and then try to harm them but he skipped that first step and I just let him hurt me