Just want my dad to love me...

Every other weekend my dad gets to have my little brother and sister over. I come over if I'm not working to see them all. Yes, I am 21 and married and everything. My dad and I were best friends when I was little. Then something changed and I don't know what it is. I try so hard to talk to him and like actually be his daughter, but it's like he wants nothing to do with me at all. He calls and talks to my sister (his daughter) and my step brother (not his son) every single night. He just divorced my step mom a few years ago and he is the only dad my step brother has known, but he treats my brother like his son way, way more than he treats me like his daughter. He never even texts me and barley answers my texts when I text him. It's like 1 word answer texts. I tried to talk to him this weekend, and he just turned the volume up on the TV show he was watching and ignored me. I feel invisible around him. Idk what to do to try and get him to love or like me anymore. I know at adult age you don't expect gifts for holidays, but on Valentine's day this year he gave my siblings candy and stuff and completely ignored me, got me nothing, and didn't even say happy Valentine's day to me. I got him a gift though. I'm just so sad about the whole situation... 😞😢💔