It will not get any better

I thought last year was the worst year for me, mental wise, and that it will get better from then. But going into the new year, I've lost some friends, then my parents get devorced, then loved ones drop like flies. Now I know there is always a deeper low point and it can't get better.You can't tell me that life has highs and lows, cause i have been on a downward path since like 3 years. I've got nobody to talk to and even if i had somebody, i couldn't open up about anything. I want to get better, i really do, but i can't see a way to achieve this. Please give me advice on how to get better, thanks in advance. (for context: I'm 18)