plz answer me a simple question of "whom"and"who" first question, is the title a correct sentence? if I use "about" instead of "of" in title, is it strange? second question, I heard that nobody use "whom" nowdays, is that true? if yes, here,(I met a old friend with *whom I used to study together) do u use *who" in that sentence insted of "whom"?

plz correct my diary I lay down on the green glass with watching a wonderful night view of sky that nobody image how beautiful it was, far into the night. Then I suddenly realized that how lucky I am and how happy I am, about enjoying such a amazing traveling in my life. And I thought I was so struggled with my anxiety of what I don't need to do. but there was no answer. and I am still looking for the better answer to find how to avert from useless anxiety to be happier, even 2years later from that time. if I reply to my question, I would say that there is a only way to doing it. it would be traveling somewhere, I want to go on my precious summer vacation or taking a cheerful view of life.