First, a question. Are dialogues essential? No, dialogues are not essential. A life story without the slightest dialogue can be very well written and fascinating.
It is even better to dispense with dialogues rather than write them that sound false. There is nothing worse for the reader. In short, if you do not feel comfortable with this mode of expression, abstain!
If you are comfortable writing dialogues, this is also no reason to stuff your autobiography with it. It can get very indigestible unless you tell your story in the form of a play. Why not after all. It might be a good idea.
These details made, the use of dialogues has virtues and it would be wrong to deny them.
I have something important to tell you!
I’m listening to you Aurélien.
I love you!
In indirect style, this would have done something like this: Aurélien declared to Aurélie that he loved her. Admit that in this case, the dialogue is much more impactful.
I have something important to tell you (instead of: he had something important to tell him).
“I love you !”
A child does not speak like a grandfather or a businessman like a poet, or an honorable mother does not speak like a thug.
Do not fall into the opposite excess either by making a caricature of spoken language:
Oh well yes then, I’m not telling you the thing Loading the guy if you knew
Do not be too talkative at the risk of killing the dynamism of dialogue. Avoid long paragraphs, aftershocks should follow one after the other.