My girlfriend (18F) tends to overthink a lot, and it's starting to make me feel like she might not be that interested in me. Am I jumping to conclusions, or should I be more understanding?

My partner (19M, 18F) and I have been together for seven months, and we truly love each other. We've had many discussions about the seriousness of our relationship, and while we've had a few disagreements, we've always resolved them quickly because we're both good communicators. Lately, though, she occasionally has doubts about our relationship, questioning whether this is the right path for her or if she should explore other options. It’s important to note that she has never asked for a breakup or a break and has told me that her feelings of uncertainty stem from overthinking, something she’s actively working on. She's very open about her feelings and has expressed her belief that we are meant to be together, even discussing the possibility of marriage in the future. Yet, her moments of doubt make me question her commitment and leave me feeling underappreciated. On the positive side, I have no doubt about her love for me. She has always treated our relationship with respect and affection, making me feel valued. However, when she shares her insecurities with me, it hurts and causes me to feel inadequate. I'm seeking advice on whether I should continue to hold on to this relationship or consider moving on. I genuinely want to make it work, but I’m open to taking the necessary steps if needed. I would appreciate any advice or perspectives on this situation. Thank you!