Happiness is a choice. You can choose to be a happy person and control your view of life to be a positive one; but you cannot control your emotions, for they are what makes you human, or humane.

Things happen in life.

Some people believe in never getting upset, in never getting emotional, in never being vulnerable.
They dislike those who always have some sort of problem to confess or complain about, or, they do not mind, and accept that these people make up the majority; but they do not want to be one of them.
They never want to be seen as 'sad', or to admit that to themselves.

But really, it's completely understandable.
It's completely understandable that in certain points in life, even the strongest will be affected. Yes, even those who are always seen as the advisors. Even those who always seem positive, who always seem to be happy.
They are ultimately still humans, after all.
Besides, these are the kind of people who tend to keep to themselves about any personal thoughts and beliefs, for they are supposedly the 'advisors', and should never be 'sad'. They place these expectations on themselves.
We do not talk about ourselves, for most others will just shrug it off and call us 'emo'. Most others only care to cap a label on others without trying to understand their emotional depth first. Many do not have the capacity to do so.
So, how can we open up?
It's really tough to be vulnerable in front of shallow people.
It's even tougher when you are not one to share easily.

Therefore, it's completely understandable.
That you do not want to open up, that you do get affected, that you do not want to seem so.

However, do remember, that only machines are capable of never feeling anything.
It's perfectly alright to be upset. It's perfectly alright to get stressed. It's perfectly alright to be at conflict with yourself.
It's perfectly alright.
It's perfectly alright to cry; you should.
It's perfectly alright to be angry; you should.
It's perfectly alright to be human; you are.

It's perfectly alright to have emotional moments that leave you feeling exposed and vulnerable in front of me.
It's perfectly alright.
As long as after breaking down, you are able to pick yourself up, and continue having a positive outlook on life, you will be forever amazing to me.
I don't mind.
For humans need to have these moments, and so long as it doesn't change the beautiful soul they are: that is positive, calming, and understanding; it's perfectly alright.

It's perfectly alright and I will love and accept you, my friend, for the human that you are.