I'm assuming life stuff rather than suicide? I think you either need to be lucky enough to find someone who is interested enough/ can empathise enough with you to try and picture life as you see it. Or, to try to find peers going through similar problems. Some of my strongest friendships have revolved around being worried about similar things in life. There was simply more understanding and tolerance to talk about the same issues over and over.
You could try sharing on this forum although obviously, it's harder not being able to divulge so much personal information for fear of doxing.
But yes, generation gaps and different interests make understanding/ support tricky I think. I've had that feeling though- of feeling largely alone and that divulging worries just leads to well meaning but empty platitudes but also annoyance sometimes.