Oh yeah, don't vent, just swallow your problems in unhealthy ways.
You know what kills people? Keeping all problems for yourself. Do you know what hurts your relative? Finding you extremely depressed, dead, or distant, because they clearly will see you bad at some point, yet you will refuse to talk, because the internet said so.
This content is targeted for the wide society. Most people don't really care about anything, so you just have to get along. The people they tell you to cater to are the very same who attack the suicidal for their feelings for being too weak. They don't want you to vent, or anything that inconveniences them, they want you to get along and pass the time. There is a huge problem with mental health who needs to be addressed in first place, so this BS doesn't happen. Will you really be happier with this kind of people around? What you should be doing in first place is getting people who cares about you. Filter the bad weed and get people who allows you to be the way you are, not the other way around, and why so many people feels completely lost in the current society.
I'd take any YouTube advice with a huge pile of salt. If you want advice, get a real therapist. Maybe it's not intentional, but YT videos mostly exploit the insecurities of vulnerable people, instead of talking about the real issues.
This doesn't mean you should isolate from others, or that you shouldn't change your bad traits. If you get in a relationship that matters will take some work om your part too. As a proof of that, people here vents literally all the time, in worse ways than the people who watches those videos, but it allows to bond over similar problems, and users create strong bonds regardless, even after successful recoveries.
BTW, we are only users, if you have a therapist, they may be better suited to answer your concerns about mental health.