As humans, it's natural that we all feel frustrated and anxious and have many more mood swings together.
Let me share one story of mine, when I was transferred to another school after spending 13 years in my previous school, suddenly all of this happened, and it was hard for me to adapt to a different environment, at that time I was also think that I should stop going school and etc... But at that time, luckily I had a good friend who was my mom, I thought that I was a nursery kid and didn't want to go to school, and my mom gave me that strength and confidence at that time I was like suddenly feel more confidence and tried to accept new environment and also I'm thinking about how become I was like that,
To be honest, I am an introverted person, so it's not easy for me to adapt to new environments & talk to new people it's not easy for me like I was overthinking sometimes when I'm in a crowd or with someone who is a stranger to me... It's really hard when you know what is your weak point.
But, when you grow up, you understand that situation and try to find a way to tackle it, being introverted is not that problematic but it's pulling you backward from socializing with others, what others think it's doesn't matter, I just want what is good for me, what makes me happy or satisfied other than that we all face fear in our life and sometimes it's not related to people or things but with your thoughts like...
More questions like that... I hope you relate.
But, the main point is. You should take a moment and think calmly, and try to be the only person who does not get scared by thoughts, & when you are in front of people you should act like their opinion for you will never exist, for your matter is your opinion for yourself,
Because that's the only way you can overcome the fear of anxiety/frustration/overthinking, etc.
So, I hope you can also think about your opinion first because it matters more.