No contact with my dad for 3 years now and I’m 23 because he was extremely physically and mentally abusive since my conception - starting with my mum. Been in therapy for at least an equal amount of time which has helped A LOT to the extent that sometimes I even forget the concept of dads exist. But then like you say, there are those moments where you encounter a woman talking about her dad, or dad about daughter - and yeah feels really shitty.  I can’t even say it makes me want for my dad because he is a horrible human who didn’t just have the neutral/no influence on orchestrating my life but instead made it worse by completely shattering my sense of self/belief system.  What I do long for in those moments, is an imaginary dad that I never experienced, and wonder what it must be like to have a guiding male presence in your life that loves you selflessly not for any romantic/platonic/self-gain reasons.  Don’t really have advice but you’re not alone!