Does anyone else have those days...

I cant help but have the days where i feel extremely depressed… most of the time i’m a very happy person, but the past few months have been hard. Growing up i got depressed a lot but recently i cant help but feel alone and isolated. i feel like my life has no meaning and theres no point to it… I’m in no way suicidal but i just don’t know what to do. i feel like i’m replaceable to everyone around me. I’m still young, only 17, and I know i can get through it but the days and weeks like this are difficult. I can’t verbally talk about things like this without completely breaking down… I’m just not sure what to do.