The case of infant is really different. As an adult, you're supposed to make a mature decision backed on serious thinking. Once again, it seems to me (but I may be mistaken) that you refuse to take your responsibilities saying "I was lured..." as if you were not responsible for your actions. YOU
took the final decision to leave. It would be too easy to say : "I was driven to sin by the evil". Sorry but it doesn' t work, You sin, we all sin and we are not to look for apologizes saying we were victim of such and such.
Moreover, it seems to me that you had an approach to orthodoxy that was purely intellectual. Leaving because "Orthodoxy is irrelevant to the modern world." indicates that you did not care at all for dogmas, theology, holiness, i.e the truth but only for fitting into the world
which is not a theological argument at all. I hope
I emphasized the question of practice because you appear to speak about knowledge of orthodoxy, saying that since you studied, you know many things etc. But now, do you practice orthodoxy (in particular in your private prayer life)? Have you already begun to do it? I do not know your story but when I read you, you appear to be as a person that does not the responsibilities of his past behaviors, looks for apologizes for his mistakes saying he was young, immature, lured, deceived... I can be wrong of course.
Well, I will stop asking about this particular things but the only advice I can give is to talk to a priest (write to a bishop), not the first one you saw of course and explain everything in detail. But don't be surprised if they require time to test your determination. Actually, this is what I would personally do.
Good luck. By the way, since you've not officially made the step to come back to orthodoxy, we may be speaking for nothing.