Balancing Islamic Values in a Co-Ed University Setting

As-salamu alaykum everyone. I'm the eldest daughter from a religious Muslim family, and I've always been careful about maintaining proper boundaries. Alhamdulillah, my family has raised me to understand how a Muslimah should conduct herself. Recently I started at a university where brothers and sisters study together. I've noticed some brothers in my class behave in ways that make me uncomfortable – they talk about girls and try to get close to them. One brother approached me initially, but I politely declined. While most now understand I'm not interested, I still feel some don't respect boundaries. Given my upbringing and Islamic values, I avoid interacting with such brothers. But since we're classmates for four years, I try to maintain peace without compromising my principles. I joined a study group with two sisters and two brothers. Alhamdulillah, these brothers are respectful and make me feel safe. The group was already established, and I joined later. We have a good academic relationship. One sister in our group, let's call her V, is kind but very outgoing. She interacts easily with brothers and just wants to enjoy university life. She never pressures me to do anything I'm uncomfortable with, which I appreciate. The issue is that wherever we go, some brothers from our class follow and try to talk to us, often using excuses. One brother from my group mentioned that some brothers like me and ask him to arrange conversations. I usually keep my distance, responding briefly with "hmm" or "yes" when necessary. I try not to be rude while maintaining proper boundaries, but their persistence makes me uncomfortable. I also worry about my reputation – if someone who knows my family sees me in a mixed group, it could be misunderstood. I wouldn't know how to explain the situation properly. This is causing me significant stress. I cannot tolerate even minor damage to my reputation before my family. My family believes I shouldn't interact with non-mahram men, and I fully understand and respect this. I want to follow this properly. Everything developed so naturally that I didn't realize how things reached this point. Now I need advice, please. Can anyone suggest subtle yet clear ways to handle this situation peacefully? I want to resolve this while maintaining Islamic principles and finding peace again. This situation has been weighing heavily on me. JazakAllah khair for your understanding.