Psychology Problems Advice Info

Recently I have been taking a human sexuality psychology class and we just finished a section on child sexual abuse. We were going over the long term effects of a child who was molested, such as depression when they were older, social anxiety, and having a difficult time being intimate with someone, when it occurred to me that I had all of those characteristics. I don’t know if it was just me being paranoid, but I then remembered a time when I was 3 or 4 that a boy about my age told me he wanted to show me something and that he wanted me to come into some bushes with him. When we were both hidden, he told me that he wanted to play a game with me, and told me it was called kiss a private touch a private (its really weird typing this, by the way), upon which he pulled down his pants and revealed himself to me. I didn’t want to at first, but he told me it was okay and that it was just a game. We then began to “play”, the whole time me thinking that this was weird that he wanted me to do this to him. I don’t remember much of him doing things to me as much as I remember him telling me to do stuff to him. After that, he approached me a few days later and told me to come into the bushes with him. I told him I didn’t want to, but he told me it was okay again. He then continued to touch me as i somewhat uncertainly touched him, and after a few minutes, I ran out of the bushes and told my mother. Now, my mother wasn’t exactly the best mother, but I think she may have brought it up with his mom.
I didn’t ever hear anything about it, and no one spoke to me about it. However, my sister knew and she would always laugh at me for it, as well as tell all my friends what I had done. I always felt ashamed and embarrassed when recalling this memory or having to talk about it when my friends made fun of me. I am 19 years old and hadn’t let a boy kiss me until I was 16. I always felt weird about hugs from people, and I developed clinical depression and social anxiety. When I brought it up with my father recently, he told me that what had happened wasn’t a big deal because we were the same age, but something inside me still feels wrong about it. I’m not really sure what to think, and I’m not really sure what getting an answer will do for me. All I know is that after dating my boyfriend for three years, I still have a hard time letting him touch me or do anything to me intimately down there, and I’m not sure if this is why I feel so weird about it. Am I just being silly because me and the boy were the same age? Or do I have a legitimate reason to question this? I’m just not sure what to feel, or if I’m just feeling this way because we studied it recently. Please help.