No, that's perfectly normal. It's the textbook reason why many (all?) people including the previous anon recommend not to repress/forget. Even consciously forgetting without reframing would lead to the same stress overflow even if it's just deja vu and can lead to stress related symptoms like loss of anger management or tumors or something else. I'm no expert though.
In fact sometimes being able to keep calm is the worst thing that can happen. I'm not saying you're going to be a serial killer but almost all great psychopaths/sociopaths have an uncanny sense of being able to keep calm under both repression and when frustration flows onward that they can actually plan better the more frustrated they are if only because they can be both desperately aggressive while still remaining in control.
The idea that something can still set you off (while at the same time you can remain calm when it doesn't) just shows that you are average or more healthy than you think. You're just in a tight chain of life and you don't have any other ideal choice on hand other than to repress. (at least choice as in knowledge of a better method)
Believe me, you don't want a cursed life. Having a cursed life doesn't just mean things blowing out of proportion. It can mean not even being able to remain calm at all. Like a situation that just won't let you breathe or it can be the opposite. You can repress so many things that you can't question your own life. You just live within the rules of your society. You think you're thinking but you're not. When your world view changes, you blame or praise others just to keep your world view intact. It's a scary life and sometimes the reason you're in this ditch is because the people around you did choose to live a cursed life so by following a similar path to them, you're also just spreading the likelihood of more people suffering what you're suffering now.
I don't mean this as a way to guilt trip you into the cliche idea that "there are people suffering worse than you". Each of our lives our different and everyone of our own experiences are just as valid regardless of whether it compares to the pain of a hungry child in the poorest parts of Africa or the stress of a soldier who has to choose between his life or the innocent civilians of the country his politicians tasked him to invade under the falsehood of national society.
All I'm trying to say is that I believe based on your statements that you're leading a blessed life. I don't expect you to agree with me but IMO a person's life is blessed if they can still have the opportunity to think when they are bombarded either by pleasures or by burdens. As long as you can think, you still have the opportunity to be you and to seek the freedom to become more of you. Yeah, it'd be nice if life would just give you a break and doesn't feel like being trapped in a web while your body is bombarded by leeches everytime you get a break but so long as you can still feel like you're being kicked in the balls, you're still blessed with the natural realization that you're alive and so long as you know you're alive, your curse will always have a small percentage of expiring. It's those people who let their cursed life get to them that don't have a chance. Even if opportunities present themselves, they won't choose to change. Believe me, it's scary stuff.
Heck, I can't share any personal details with you but I'm in that spot now. I used to feel like you and I thought that was the cursed life but now I'm in something worse and the worst thing is that nothing's changed. The same things that I used to live with just stuck to me more and I've just grown weaker and older. If I were you, I'd forget about forgetting and just focus on escaping and fighting back. Since this is a NEET board, I'll assume you're a NEET.
Well I used to be a hikikomori. A non-Japanese one. Still living a hikikomori lifestyle but I can't even say I'm one anymore just because I went through events that broke my streak of being indoors. Take it from someone who lives in a crap poor country but not extremely desolated like parts of Africa, being NEET is not enough. Being Hikikomori is not enough. Forgetting is not enough. Remembering is not enough. Repressing is not enough. No one method is ever enough.
The one thing us people who feel we live a cursed life lacks is we rarely encounter a mob full of cursed lives. Our suffering sometimes makes us ignorant (or hopeful) that maybe this is the limit of human apathy, hate, evil, blindness that we'll ever interact with until we meet up with superior numbers, superior selection of diversity, superior levels of darkness and one day we just wake up and realize there's a cursed life between what we thought is the cursed life and this new one is the cursed life. This new present is not just an improved cursed life of our previous cursed life, no...it's not only way worse than we imagined, it's way different.