does this ever happen to you?

You’re just randomly chilling on a random Wednesday evening, you’re done with all your work, and suddenly a wave of sadness just hits you, you try to find the root cause but, faces are blurry, events are scattered, you struggle to remember the last time you were happy, and yet you do not know why you’re sad.

You try to talk to your friends but they seem to be happier than you, you try to watch a comfort movie but it reminds of the times when you actually got happy by watching it...

As you try to find the root cause, you become even more sad just by thinking of why you’re sad.

I don’t know about you, but this really occasional for me... how do I avoid this?

Go out for a Long walk or run. For example right after you finish your dinner and dishwashing.
It might help clear your mind, and also make your body tired, to the point where your body will welcome a relaxing hour or two on the couch.
Where your body goes, your mind will follow.
Sadness often comes with physical laziness.

I don’t get it:

I don’t have any friends. So am I sad because I don’t have them? Or am I sad because I can’t tell them I am sad?

Humans are social creatures.
We ain't ment to be alone.
Of you don't have any or many friends, then this might be the cause of your sadness.

Perhaps join a social club.
It can be in sports, or a game club, like roleplaying or an offline chess club.
If you have any hobbies, perhaps see if there are any clubs or organisation near you with similar hobbies and join them.

Last year I myself started running with a friend of mine, every Sunday and 2-4 times on weekdays before work.
Even though I ain't in the same shape I used to be in, I still look forward for every run, especially the Sunday run.
Partly it helps me get back in shape, but equally important, it's also a social event where my friend and I talk about everything.

Trust me if hear about my condition you’d think I’m not a human.

I’m 14, supposed to be in eighth grade. Already completed studies till 10th since the past 7-8 months, school is boring to me now, no one’s ready to teach me the 11th grade studies I left 8 months ago as all the other classes have completed the syllabus, since the past week I’m not going to school, I hate any physical work, I don’t like studying online, so learning anything new online is just not going to happen, I had 2 friends, but they got exams so both of them can meet or talk to me after 4 months, I used to cycle everyday for about 1:30 hours (roughly 25 km), I got zero motivation to learn something new, I just don’t know what to do man

The Greek doctor Hippocrates already defined four different human temperaments: sanguine, phlegmatic, choleric, melancholic.

Of course, every person can combine all four descriptions in their personality at times, but you would probably be primarily described as melancholic.

@LOoOoOoOoL123
> I don’t know about you, but this really occasional for me... how do I avoid this?

If it happens to you often, it bothers you a lot and you get more and more blocked over time, then you should seek professional help. In any case, they would then be taught techniques to counteract periods of sadness.

I can only warn you against hobby psychologists who spread their "wisdom" on the Internet!

@LOoOoOoOoL123 said in #1:
> You’re just randomly chilling on a random Wednesday evening, you’re done with all your work, and suddenly a wave of sadness just hits you, you try to find the root cause but, faces are blurry, events are scattered, you struggle to remember the last time you were happy, and yet you do not know why you’re sad.
>
> You try to talk to your friends but they seem to be happier than you, you try to watch a comfort movie but it reminds of the times when you actually got happy by watching it...
>
> As you try to find the root cause, you become even more sad just by thinking of why you’re sad.
>
> I don’t know about you, but this really occasional for me... how do I avoid this?

Meditation and yoga
A phychologist said in an article
At times when you are Sad, try have a nice walk in the morning sun in fresh air . Or go for a jog in the evening .

@Tenakel said in #6:
> I can only warn you against hobby psychologists who spread their "wisdom" on the Internet!
Why?
Listening to others experience may or may not ring true to someone's elses situation.
There is no harm in that.

Now excise is a proven method against many illnesses, both physical and mental health.

-The OP is currently in a situation where he/she can't find motivation.
-He is cut off from social interactions with his circle of friends.
-He is also cut off from interactions with people of similar age. (Based on limited knowledge of the situation)
All of these alone can be a cause for sadness.
But I don't think seeking professional help, would erase those problems. Not to mention the cost of it.

I don't have any advice for finding motivation.
But the OP's changing of moods, seems to come from a lack of social activities with his peers.

Exercise combats boredom and depression. You might not feel like it and might think that it will not help, but after you make yourself do it for a while you will be surprised about how it helps you mentally and emotionally.

@LOoOoOoOoL123
Yes, maybe it's a classic mild depression, take a vacation, go hiking away from this damn noisy city...