not in love with my child's father

We've been together for a year this month. I had just started seeing him for a few weeks before I found out I was pregnant and almost aborted because I knew we weren't meant for each other. Something is missing and I haven't been in love with him from the beginning. He's the sweetest guy and is an amazing father to our baby girl, for us both being 20. But I'm not in love with him. Everyone says I'm going to make a mistake if I leave him and everyone says I need to try, but I feel like I've been trying for a year to love him and I just can't force myself. What do I do? Will my daughter hate me when she gets older and understands things?