Life isn't serious. I feel bad for people who take it so.
"Ha Ha," you may think.
"What a jokester, but really life is a very important thing."
No, it isn't. Sure, life may apparently be all you have, but that doesn't mean it's all there is. You eventually lose it anyway. Why frantically worry about what you're inevitably going to lose? Life is a game, except there are no winners or losers and everyone quits after 40-70 years. Like any game, life involves a great deal of luck. Where you're born, who you're born to, what lucky events happen are all completely random, or at least unknowable. and yet these things drastically affect your life. When vast swathes of your life are completely uncontrollable, why panic over the few things in life that are controllable? even these things will eventually fall out of control.
For example: You can't make people like you. Research shows that the decision happens well before you even begin to consider it. You may have the illusion of controlling others emotions or reactions, but first impressions really are the most lasting. So if you have little control, why fret about the small attempts to change things?
Of course the real problem here lies in determinism. Free will doesn't actually exist. The idea of universal causality precludes it. If you attempt to disprove universal causality, you find yourself with the conundrum of a completely random world, wherein impossible things might happen all the time. If the universe is as structured as science would have you believe, then complete randomness is an impossibility. Anyway, I feel too lazy to delve further into the proofs for determinism.
And it leads to another conundrum: why do I bother attempting to change people's minds about the seriousness of life? If free will doesn't exist, they would believe or disbelieve regardless of my exhortations. Well, the easy answer to that is because whether I like it or not, I would be exhorting.
Anyway, since you don't have any free will anyway, do what you want. Or, more specifically do what you were going to do anyway.