Value discrepancies [20M] [20F]

I'm feeling uncertain about what to do. My girlfriend and I have significant differences in our values that could impact our future together. To put it simply, she isn't particularly interested in adopting my last name, which is something that's very important to me. She’s also unsure about when she wants to get married and feels that her family might not allow her to until she reaches her 30s. She even asked me what I would do if I sought her mom's blessing and her mom declined—almost as if she expects that outcome. I'm just feeling lost right now. Being the youngest of three, she mentions that her family tends to be protective of her, and it seems her mom has a major influence over her life choices. I really don’t know what to think or how to proceed.