Am I really being helpful?

So, I'm a bit worried. My friend frequently has moments where they go into depressive and suicidal episodes(?). They've had a few attempts and each I've been pretty scared that I'd never talk with them again. Everytime, I do my best to offer any type of advice or support that I can. They're family situation is pretty shitty and since they're also a minor there's not much they can do about it. And since this is just an online friend there's not much I can do either.

It feels like, even with all the support I give them, it feels like it just will never be enough. And, I know in a way it kinda won't. Since online friends can only do so much in a real life situation. It's only an escape not a solution. But still, I feel so stressed. I already overthink what I say and how I act, and having to choose my words carefully as to not upset my friend or make sure they know what I'm saying is out of care is just.. a lot. I'M NOT TRYING TO SAY COMFORTING MY FRIEND IS A BURDEN. Please don't misunderstand.

I just wonder if this hopelessness is a common feeling for people with suicidal friends (especially over the internet). I wonder if I've done any good at all. But I also don't want to make it seem like I'm making this a "What about me?" Thing. I'm not trying to play the victim or anything. I just don't know what to do anymore.

I don't know, everything is so stressful now. I don't know if I should just keep quiet more. There are too many times where I constantly overthink if I should've said some thing else or worded it differently.