how do i get rid of this dreadful feeling???

anytime i'm not doing something really hard, i get stuck thinking about the fact that it feels like my entire life is going to be just okay. like there's no reason to really stay here because i'm not anyone, i don't feel like i have a purpose and i'll never have a significant impact on the world. i've never had mental health issues that physically hurt, it feels like somethings constantly squeezing inside my chest.

i have a horse, i go for runs, i workout, i have a schedule, i read, i write, i draw, i play piano, i wakeup early and go outside, eat well, drink water, have good hygiene. it feels like i'm doing everything i should and i just can't get rid of these thoughts and feelings.