You were under 18 years if age, so you experienced childhood sexual assault (CSA). If you were penetrated (somthing was inserted into your mouth, vagina, or anus), then you were raped. These are technical definitions. Really, that doesn't matter, though. You, a child, experienced trauma at the hands of an adult. You were violated.
No matter the specifics, you need help, so you can heal, and have the beautiful life that you deserve.
I think you are maybe held-up by the "statutory rape" legal term. In reality, an adult used you for their own sexual gain. That is simply wrong. Most likely you were groomed to feel like this was a "relationship" that you wanted to participate in with the abuser. This really messed with your mind, as it would anyone's. That is why you need a good counselor, someone experienced in working with CSA victims.
Yes, you were a victim. However, you can seek help, which (by the way) you have already done, by posting here. Healing from this type of abuse is hard work, but you are so worth it.
I pray you will find the exact help you need to fully heal, and enjoy a full life.
Take it from someone who was raped at 12-years-old, and waited over 30 years to get help: Sooner is better than later.