I think we should look at this in another way.
What is "bitter"? Is this for some reason a continuous emotion or mindset?
Could it be that calling ourselves "bitter" is just an excuse? Just something we can say to catalogize ourselves, to say "Alright, Im bitter. That's What I Am", and then stop thinking about it? Accepting it?
I think it seems far more reasonable to accept bitterness as an emotion: Temporary. I believe all emotions are temporary. Even falling in love with someone at first sight only to live your entire life with that very person is temporary. It's not always been there, and even at times when you know you love, you may doubt it. That is what I choose to call temporary: Anything that is not permanent.
This problem seems so common. Us, young people, considering ourselves unhappy, because we're using one word as our defining characteristic; Im BITTER. Im DEPRESSED. Im ASOCIAL.
I have my experiences with bitterness, depression and sadness. Since two years back Ive been diagnosed with OCD and Cyclothymia. And when I first found out about my illness, I made the mistake of defining myself with it. "Alright," I thought, "Im depressed and a mentally unstable person."
But I came to realize that sadness only exists if you allow it to exist. Sometimes I suppose you even have to. This also applies to being "Bitter".
I mean, just look at the title of this thread. "Is 18 too young to be bitter?"
Immediately, I get the impression youre ASKING if you can be bitter, if youre allowed to be bitter. That's just strange. It's as if we assume that there is one permanent emotion in life. A life of Love. A Life of Sadness. A Life of anger. In our pursuit of a good life and a life we enjoy, we are sometimes so desperate or afraid that we wont find the life we're looking for, which is unrealistic, that we settle for one single emotion. Or, atleast one main emotion. Such as bitterness.
Life should rather be seen as a continuous flow of moments, each one with their individual truth and emotion. Day one, I am happy because I kissed my girlfriend. Day two, I am unhappy because me and my girlfriend got into a fight. Even people who find safety and familiarity in calling themselves lonely are unable to escape the fact that life isnt rigid: Life is like truth, always changing. Day one, I am happy because I enjoy being single. Day two, I am sad because I sleep alone in my bed.
Nowadays it annoys me that people call themselves bitter or asocial as their primary characteristic. They dont need to. Calling yourself one particular emotion is just a waste of time, a temporary solution to a temporary problem, and not even a particularily good one. This works the other way too: A man should not consider himself happy. It will just make him question whether or not he is. Trying to lead a fixed life leads to uncertainty and insecurity. Leading a life where you adapt, and accept the different emotions that are thrown at you every day seems to me a lot more reasonable.
Look, its late and Im tired... Not sure if i got everything i wanted to say written down. hopefully, you'll understand my point of view nevertheless.
EDIT: A cynic, of course, understands a part of this. He looks at life critically and judges what he can.
However, he is still not free of that particular mindset. He has still chosen to call himself a cynic, or a critic. And that removes some of his freedom. A cynic is a person too attached to the old idea of a rigid life of one truth, to accept the newer idea of life as a continuous stream of moments and truths, too attatched to completely let those old ideals go. As a result, he might live the same life of someone who has accepted and embraced the new idea, but still he is not completely free, since he considers himself a cynic. He is trying to achieve formlessness through form, which is impossible.
At least, that's what I think.