Thank you! You have summarized the anicca, dukkha, and anatta nature well.
But keep contemplating the suffering endured by all living beings. That is the true Metta Bhavana and that will make your mind calmer.
– I had similar feelings in the early days too. I was quite frustrated that my friends could not see the “danger”. But, then I realized I had also not realized that during all this time in the rebirth process.