Is this normal?

My 8 month old seems to just not like me, hardly looks at me or makes eye contact and likes to play on his own. He loves my fiancé and looks at him and loves other people. It really hurts every day, I don’t know how to play or interact with him because he just acts like I’m not there. He won’t listen when I call his name or even if I say “hey!” Loudly. It’s like he doesn’t care😔 anybody else’s baby like this? Is this normal? Everything I look up says “autism”, I did take high amounts of vitamin b12 during pregnancy which apparently has been proven to increase chances of autism, but he has been very advanced physically and somewhat socially (started saying mama and baba around 6 months) he started rolling over at 10 weeks, crawling at 6-7 months and pulling himself up onto everything at 7.5-8 months and could stand up for a few seconds without holding onto anything. I also noticed when he started learning to crawl he stopped saying mama for a while and started again, then he started to learn to stand himself up and stopped. Is that normal? I’ve just been worried all day and crying because I don’t know why he acts like I’m never there :( he used to love to play and stuff more than he does now. Last time I asked this I got a lot of hate for it but I just want to know if anyone else’s baby is like this because all my friends baby’s love them and stuff.