I’ve never queried my parents intentions or motivations.
They weren’t great parents nor were they terrible. I think they did their best given their resources, knowledge, and societal norms.
I have however managed various mental health issues most of my adult life, and I know that most issues which make me miserable, would not make me miserable if I were not already miserable. For example, when I’m stressed and miserable I tend to get fixated on things happening at work and stress about them a lot more than is really warranted.
I can’t say I can relate to how OP feels, but I feel as though, if my dad told me I was an accident and unwanted or whatever that might change how I feel about him, but it wouldn’t really change how I feel about me.
For any person alive today, if you followed your ancestry back even just a handful of generations I’m sure there are unwanted pregnancies.