For life learningLife Lessons

Means what you have learned in your life. We also capitalize the first letter of each word in a title (minus articles and adverbs)

I'm an adult with a age of 20.8.(28 years old) so I want to tell you guys thato live athe life with as you want peryou want, live by your own rules.

We use "an" instead of a for words that start with a vowel (a, e, i, o ,u). To say you are an adult and say how old you are in the same sentence is a little bit repetitive, so we can put it in () as an added piece of information.

Because lLife doesn't give you many chances to be a happy. whenever you needed, ¶
Life is a lesson for every human being , it's also tell. It teaches us too many things that we need to learn and even don't need Butone time, things we might not need. However, try to remember one thing when T. Your teenage ageyears pasts awaynd then it wouldy will never come again back so just live Tyour teenage life , do. Make mistakes so myou cany learn from that iem. It will help you in the future .

In formal english writing, we try not to start sentences with words like because, and, but.
However is another words for "but." You can start a sentence with it in formal writing.
Don't forget you need articles before nouns (the, an, a) this doesn't include proper nouns (names for example).

I'm a adult with a age of 20.8.and I'm 28 so I want to tell you guys thato live a life with ashow you want, per your own rules.

I've assumed you mean "28" as oppose to "20.8"?

Because life doesn't give many chances to be a happy whenever you needed, want.¶
Life is a lesson for every human being , it's. It also tells us too many things that we need to learn and even don't need. But remember one thing: when Teenage age past awayyou're past being a theenager, it wouldill never come back again back so. So, just live Tthe teenage life , do: make mistakes s. So many learn from thatit and it will help you in the future .

For the "don't" - "doesn't", sometimes people will say "don't" but it is actually wrong. People tend to say it either because it's slang in their area or because they're putting on an accent/making a joke.

I'm not sure what you mean by "it also tells us too many things that we need to learn and even don't need" - it doesn't make much sense to me, sorry.

I'm a adult with a age of 20.8and I'm 20 years old. sSo I want to tell you guys that live a life with as you want per your own rules. So, I want to tell you guys to live the life you want by your own rules.

In English, we usually say our age in years and months, not a decimal, but usually we would just say the number of years. The standard phase in English is live life "by your own rules"

Because life doesn't give you many chances to be a happy whenever you needed, ,¶
Life is a lesson for every human being , it's. It also tells us tooaches us many things that we need to learn and even don't need B, but remember one thing when Teenage age past away then it would never come again back s, once the teenage years pass, they won't ever come back again. So just live Tteenage life , do, make many mistakes so manyd learn from them so that it will help you in the future .

The verb is "does not" because life is third-person singular. "It tells" is the noun and verb in the next sentence. "It's" would imply something belongs to "It". When we talk about what we learn from life we usually say, life "teaches" us lessons. We would usually say "the teenage years" instead of teenage age (or you could say adolescence, which is a fancy way to talk about the time between childhood and adulthood.