Hi Jess,
I know completely how you feel, when my depression was at its worse I felt like that too. Suicidal thoughts are normal when you are feeling so low, but its pretty dangerous too, especially since you've been making plans and stuff. Just whatever you do, DON'T go through with it - I know that things are really difficult right now but things can be sorted - I PROMISE.
Just for now, make sure you are with people you can trust, and try not to isolate yourself, company can help. Maybe try a family member.
Are you on any medication or getting any therapy at all? This would help you a lot.
Make an appointment with your GP, and tell him/her about your suicidal thoughts and how you are feeling etc. They will most probably give you a questionnaire to fill in, to see how bad your depression is, and then they will see what they can do from there.
So visit your GP, and stay with people you can trust.
Don't give up, things WILL get better!
+ Remember, people on here are here to talk to, so no worries okay?
Take care xx