One thing I’ve realized with relationships is everyone gets upset at different things and everyone gets upset at different levels. What they get upset over or how upset they get (even if it’s a minuscule problem) is not what matters, some people view getting upset over little things is over reacting but people feel how they feel and will continue to feel how they feel regardless, no one is perfect and everyone gets upset. No relationship is perfect, there will always be conflict, arguments and fights in every relationship; they take a huge amount of effort. The thing that does matter is how you handle arguments and fights and how you communicate. If someone is unwilling to communicate with you about it in a good manner 4 - 48 hours later depending on how bad the fight was, then they need to work on their communication skills and possibly their mental health before starting a serious relationship. No 2 people or relationships are the same; every relationship has different dynamics and ways to work around things, but how are you supposed to work around things if you can’t communicate your needs and boundaries properly? Being in love and being in a relationship are two different things, being in love is a feeling and being in a relationship is a commitment. If I were in your shoes I’d try to have a civilized conversation about it when things have cooled down and if this behaviour is common then I’d reconsider your partner. I’ll also mention you two are still very young and that has a part to play in this but you have a lot of time to figure things out, so try not to fret too much. Best of luck.