Please can i get some advice I’m so lost

I never have had mental health issues and have always had a easy life to put it shortly. But these pst 2 weeks I have been acting so abnormally, tonight was an example where the neighbours kids were yelling and it’s now 1am and I cried, threw my phone down and yelled(threw a fucking fit) just because tomorrow I would have to wake up later as I want to get a full 8 hrs of sleep to catch up on the week and I have to revise. Yes I have exams next week and then I have mocks in Nov, I am stressed about them but I’m so confused why I feel like this. I have always been happy and content but the desire to achieve great grades and go to a great college and basically earn the lifestyle I want to live is so overwhelming. In the moment i feel so emotional and angry and then after I think wtf is wrong with me, it’s ok I will meditate and talk about it then move on...then I’m fine. I personally don’t think I have any issues mentally I think it’s just stress, but can anyone relate to this or give me their thoughts on what they think I am mentally experiencing right now? Thank you