It was saying something on the lines of connecting to the servers then it boots me to the main menu
Ok. Have you done any network troubleshooting?
No because I struggle to understand what to do
Ok. I would recommend reading through our [url=https://www.bungie.net/en/Support/Troubleshoot?oid=12915]network guide[/url] first, and trying whatever you can in there to see if anything helps.