Uncomfortable/ not as ready as I thought

Ive been with my boyfriend for a year now. So i met my boyfriend’s daughter he’s 19 and had her when he was 17 turning 18. She’s one turning two. I felt sooo uncomfortable and unhappy. She did not want to be around me. Anytime he left the room she chased after him and tried to go around me like I’m a wall. I tried playing with her and getting her attention but she just kept rolling out of my arms and doing some gymnastics shit. There’s a was a few times I thought we was sharing a moment but then she just literally rolls away. I wasn’t ready to meet her if I feel this type of way. I left early in a sad mood, I wasn’t going to stay because i felt uncomfortable and I wasn’t having fun like I thought i was. There’s a lot of kids in my family and they neverrr did that to me.

I only went to see her because my boyfriend kept asking me to. He just wouldn’t stop asking. So i had to go so he would stop.

Update: no rude comments saying im immature. If you don’t have any advice then don’t say anything. You will get reported for rude comments.

Update 2: thank you for the people who gave HELPFUL advice. I’ll be more patient with her and take my time getting to know her like what was suggested.

P.S I am not breaking with my boyfriend just because of one bad event and he isn’t going to break up with me either because he understands.