I'm 24 yo and I recently connected with my absent biological father

Since I've had communication with him in the last 2 years, he still has very little to do with me and shows few interest in seeing me or his granddaughter *my daughter*.

My mom tells me I need to get over it and that I'm being overly sensitive for wishing he would be interested since he's no longer absent or oblivious.

What are your thoughts? Any advice?? I feel like there's something wrong with me which is why he never is around even still...kinda sucks.