My friend has suicidal thoughts and I suck at relationships

So yesterday, my friend told me that she wanted to forget everything and implied multiple times that there wasn't a point in continuing to live. (We were communicating via Whatsapp) After the covnersation, it felt as though I was able to calm her a bit by saying stuff like whoever those people are that made you feel bad aren't worth your time and you can get through this, you've got me.

Basically, what I'm asking is how can I support her when the mere thought of having to communicate with her makes me feel uncomfortable?

Am I a bad person for wanting to be left alone? Wishing that she hadn't contacted me?

I don't want her to commit suicide but at the same time, I'm so close to finishing school, to going to university. My dream is to continue educating myself for as long as I can but I feel that if I were to support her, I'll be ****ed up in the process.

I'm probably being selfish but I hate this so much. I feel like I've made soo many empty promises to her - I'm just not the type of person to help others out. When she left her parents, I was there but even then I felt so goddamn uncomfortable.

I'm aware that since this is the internet, there will be some stupid answers but anyone that could help me out, I'd appreciate it.