My partner and I do not share a common goal.

My partner (F26) and I (F26) have been together for six years. I’ve been open about my desire for marriage and children, but her responses are usually along the lines of “let’s do it now” or “I’m not someone who likes to plan everything, as we can’t predict the future.” Each time I bring up this topic, her replies make me question everything about our relationship. She’s a wonderful partner and my best friend, but sometimes I feel like she’s not ready to settle down with me. This thought makes me feel sad, regretful, and upset that we’ve been in this situation for so long. I don’t want to give her an ultimatum or pressure her into shaping our relationship according to my wishes, fearing it would lead to resentment. I'm scared to end the relationship, but I’m losing hope for our future together.