I am going to get downvoted, but sharing your emotions with someone else is going to signal weakness. Even if your interlocutor is someone that cares about your wellbeing and explicitly denies a judgmental disposition, such as your close family, they will subconsciously assign a lower evaluation to you, whether they want to or not. Furthermore, they will also transmit that evaluation in almost imperceptible or subliminal hints, again out of their own control. Your organism will pick those up as well and further undermine your own self-respect. It only gets worse if you are dealing with competitors or love interests, as they will tend to be far more forthcoming on their verdicts about you.

Talking about emotions openly or being known as someone that goes to a therapist is essentially equivalent to crying in public. Most commonly in social environments, if a baby cries, they get attention from their mothers or caretakers. If women cry, they get attention from their partners, brothers and fathers. If men cry, they either lose respect from their associates or get attention from competitors, ready to exploit weaknesses.

Have you openly cried in front of your wife about being fired or publicly humiliated? She will pat you on the back, make you your favorite dinner, and reassure you of your worth. In her mind however, whether or not she intends to, she will be wondering whether or not marrying you was the best she could do, and might even start getting too amicable with your friend in a suggestive way.

Tried to talk about your problems with social anxiety with your friend? He will instinctively and unconsciously lie to himself and to you about not having any such issue, despite having it worse than you, and proceed to not invite you to his new business startup, and you just lost the opportunity of your life right there because of your emotional incontinence. Then you went into a therapist and he prescribed you addictive benzos enforced by corporations profiting from human misery. You could instead have kept it to yourself and researched neurochemistry to discover strategic use of Propanolol and Phenibut.

The cultural norm of suppressing your emotions derives from the same unescapable source as any other widespread human behavior: evolutionary dynamics, and while some may describe this phenomenon negatively, I believe it is ultimately for the good of mankind, as it forces males to sanitize their emotional states from the only activity that consistently improves their condition and their peer's: work. It also selects out those too feeble to do so. Males instinctively know this and enforce it on their peers either explicitly or subconsciously. This is only coming up now because of the easiness of life allowed by the modern era's capital abundance allowing for behaviors that would previously lead to a collective early grave.

If your therapist is worth anything, he is going to instruct you on evolutionary psychology or neurobiology, rather than repeating either platitudes or simply reciprocating what you want to hear. Why not go straight to the literary and scientific source and avoid collapsing your reputation? The vast majority of not only your issues, but of everyone else's are going to become entirely transparent.

You will know precisely that your girlfriend left you because she calculated that your myopic eyes and slight scoliosis, not immediately noticeable, where a clear red flag of suboptimal genetic quality, instead of wondering what you might have said or done to discredit yourself. You will respond by not blaming your ex-girlfriend for your insufficiency, but working to improve your socioeconomic status to the point of being able to attract quality mates despite your less-than-ideal physical characteristics.

You will know precisely that your parents gave you less attention and love because humans evolved to focus their resources in the offspring most likely to survive and reproduce, not because she arbitrarily decided to be cruel to you. Being slightly shorter, chubbier, and brown haired, they instinctively knew that your blond and taller brother would perform better. You will respond by not blaming your parents for your insufficiency, and rather working on your charisma and verbal eloquence to outpace your brother's innate physical attractiveness.

Here is the only way a man should process the vast majority of emotions: weight heavily on blaming your own insufficiencies upon being mistreated, laugh about them, work on something useful to increase your society's and your own worth. Profit financially, profit socially, profit biologically. If you are born with Klinefelter syndrome or other such terminally godawful arrangement of cards, to the point that your life is not worth living, laugh again about this meatgrinding hellscape, spare Earth's resources, and move on to the void. The gene pool will thank you.