I’m told to talk to people, but what if people won’t listen

People always tell me to talk to people about my problems. Almost every person I know will at some point say “Hey if you ever need someone to talk to you can just talk to me.” They tell me to talk, then when I do they don’t listen. I’ll have moments in my life when I feel like my head will explode and so I’ll sometimes unload everything I’m thinking to someone. Some will be very worried and concerned… for at most a few days. Then they assume that I was just having a bad day that day and assume that everything I said that day wasn’t serious and it’s like that big moment never happened. I don’t even have to put on a fake smile anymore and I don’t even have to try not to cry in front of people anymore. Because they’ll just forget it ever happened in a few days.