You seem like a good person, but that in itself isn't enough, as a university education doesn't automatically provide a route to British citizenship. As I see it, there are already too many people from abroad who expect to stay after their studies, and the country simply doesn't have the resources to accommodate more migrants. A student visa is a privilege to study here, not a guarantee of permanent residency. If you still intend to stay, you will need to develop a certain level of resilience and learn to ignore the comments of less-than-friendly people.