Honestly, most of the time players just have like 3 or 4 sentences for a backstory. Which is really better most of the time as it lets you build out the character over time in the game. If that's the only thing holding you back, you should give it a try!
Seconding Lutz's point! I'm a pretty casual player so I tend to focus more on rolling dice for fun and interacting with NPCs. Other party members actually will attempt voices sometimes or have more integrated back stories with the actual places in the campaign. It's definitely what you make of it!
I honestly don't know, pretty sure I saw it on Reddit a while back. I have it saved because I have a buddy who literally formats his character backstories like this and I like to poke fun at him.
I’m that player. I love writing characters so coming up with a detailed backstory for why my guy is here and what type of personality I’m going to roleplay as is part of the process.