Why depression and anxiety has become so common today . our ancestors/previous generation didnt use to get depress so much. today even people with money and successful career are feeling discontented. my mind is always hyperactive and thinks so much?

It is an unresolved issue. People struggling for their daily bread cannot afford the luxury of depression. Survival instinct supersedes self-actualization. Your observation that even successful people are often depressed is correct. Regular exercise is as effective as anti-depressant medication for mild to moderate depression. Start your day with a 30 minute bout of exercise. Wish you good health!