Yes ... This is sexual abuse.
A physical rape doesn't have to occur to sexually abuse (rape) a child.
Also, like all other forms of emotional abuse, they are often the most difficult to overcome because it's like the messages and images are permanently seared upon the brain and it's extremely difficult to erase, rewrite or record over it.
I'm sorry you were done this way as a child and I hope you can get the help you need to address the pain and harm any and all of it has caused you.