Would you hate your dad if he raped your mom, It happened before you were born.
Also molestation causes harm whether you like it or not. The girl may have been "mature beyond her years" and other such excuses, but usually such maturity is as a result of having to be put through traumatic events. Her "willingness" to do sexual acts usually comes as a result of already being forced through sexual situations. Plus any situation with adults involved can make consent dubious with children as a result of the natural advantages we have over children.
Beastiality does cause trauma to the animal, dogs are often put down as a result of said trauma and depending on how you did it can cause pain to the animal.
Each of these actions cause harm in one way or another. Would you like for me to explain how trauma works, or are you gonna argue that "you only fingered her so it doesn't count" or "well there were other guys".
Because it doesn't matter, you contributed as an adult who knew better and rightfully got thrown out of your shitty hippy home for being a gross molester.
Hell, I'm doing you a favor by not calling you a pedophile and giving you the benefit of the doubt that you probably don't get sexual gratification out of children currently. You are at best a molester who was in a shitty place who made shitty decisions.