Ann and Jobey have really said it all the only thing I can add to their posts is there is a section headed Talk to people like me on which there is a thread younger women and families which might help you as well.
Have you had your treatment plan yet as that will set out what is going to happen going forward, once you have had time to take in your diagnosis this will help you to move forward.
We are all here for you and will help in any way we can and I would reinforce the other two saying do not google your systems, there is a lot of outdated and misinformation out there. Your best source of information is your treatment plan and there is a very good Information and Support section on here with lots of easy to read booklets, I found them very useful as they set things out in laymans language.
Sending you hugs
Hi Sophie, I'm so sorry you are having to go through this at your age, we do have ladies of a similar age here and some even younger at times! The shock will settle but allow yourself some time to let it sink in , its a huge thing to deal with mentally but you will do it just takes time, once you have a plan and treatment is under way you will feel stronger and more in control , you will find lots of support across the forum here and I hope you can take comfort in reading our experiences and seeing that we do come out the other side! Xx Jo