I would like to start by saying that i don't want to self- diagnose in any way, im honestly just sharing my thoughts here cuz i feel and hope people here could help me in some way. 
Okay here we go!


So, im not diagnosed with bipolar disorder or any other disorder and ive never been to a psychologist. But for these past months I've been experiencing really intense mood changes. 
For example

There are days where I'm extremely depressed and i feel like i can't do anything, be anything, no one cares about me and im just a piece of shit. I don't talk to anybody and im extremely insecure.

But then there are days where im extremely positive? I feel like i can do anything that i think of. Im more outgoing, my brain thinks like crazy. For example I've made a detailed plan about going to and getting into one of the best universities far away from my country, and i actually believed myself that i can easily do it and i just need to think positive and because of that, I'll get there.
When i told my parents about it, they said im crazy and overly positive and that I'll never get there cuz it's not possible for me and my family.
My mom even said that im mentally unstable, cuz some days im overly happy and other days i don't want to talk to anyone and im depressed. I left feeling confused and started searching about these mood changes. And this is where i am now.

Is this normal? Should i talk about it with some specialist? I would appreciate any kind of advice or help.
And im sorry if this is not the place where i should be discussing these stuff, since im not diagnosed and yeah! 

Also im sorry for my English, it's not my first language.