better alone ...

better alone i don't wanna make more mistakes, I've discovered that i don't have why make a lie if i know that i can't feel nothing in this moment just want live day by day without any person more in my life... forgive me , but this is the truth , i'm better alone ...

Better [off] alone...
[I am] better [off] alone[.] I don't wanna* make more mistakes. I've discovered that I don't have ... ? not sure what you're saying you don't have. Why lie if I know I can't feel anything? I just want to live day by day without any [other] person in my life. Forgive me, but this is the truth. I'm better off alone.

Some of it was confusing but you got your basic message across. Just remember to capitalize the beginning of each sentence, and also always capitalize the word I.

*"Wanna" is more "slang" English. When you're writing something serious, you should say "want to". Wanna is more for speaking out loud, or something casual (ex. "Wanna go to the mall later?"