so wrong,
it is you who is the ignorant one. when the mishna is pirkei avot states that it means one should not live extravagantly, rather one should live simply but one could do so with experiencing some pleasures of olam hazeh. do you know why a nazir has to bring a karbon chatos after he finishes his nazir cycle. it’s because he denied himself legitimate pleasures that one is allowed to have in olam hazeh.
so please before you comment, fully understand the sources that you are quoting.