i don’t know what iam doning right now but iam just doing it

i’m just 18 and i feel so much sad,lonliness,hurting i’m literally suffer from things, i don’t know what things are or why i feel like this way .i don’t what the problem or the solution .i want to do so so much things and i set down , plan for it and resolve to do it ,but only do one of ten ,after that i feel like i will be in the future like disaster and the biggest failure on the planet 🙁 and the real disaster is my family’s problems .they can’t be beleived . also my ex it’s very complicated i can’t move on because when we were together i felt so great about myslef and he was very kind ,loving and respectful but after breakup i really can’t see the truth