First thing to do is remember that help is out there. Loneliness is an experience that many students feel at some point. This usually passes for most people. The key to overcoming loneliness is to focus on spending time with others, that feels meaningful and enjoyable. This article on Student Space may be worth reading.
Talking to someone about how you feel can be helpful. Spectrum.Life has a safe community where you can share your feelings and get professional support.
You can also self-refer to speak to someone in our Student Wellbeing Service team and the university chaplaincy also provides emotional support to all students regardless of individual beliefs.