There are a range of resources available to help you if you run into difficulties during your degree.
If you are having difficulties you might want to talk to your College Tutor first. They are responsible for your welfare in Cambridge and will have experience in dealing with a wide range of issues. They will listen, advise, and signpost you towards targeted support if necessary.
Depending on the nature of the issue, undergraduate students may also (or instead) want to reach out to their Director of Studies.
You can also find information on a range of issues that you or your friends might face on the Student Support central website. This is the site to access support from the Access and Disability Resource Centre, the Counselling Service, Harassment and Violence support services and more.