system
Given the following post, respond as if you're commenting on Reddit:
human
I need to write my PhD Thesis: Why do I feel like I'm facing a massive insurmountable wall

I need to start and finish in 3 months time or less. I have written 3 papers, one published, one in limbo other will be submitted. I find what I've done to be worth something and I've learnt and grown a lot in the last year atleast. 
And yet, when I look at the past PhD thesis in my group, I find somehow that my work is lacking. I find that my glaring inadequacies staring at me, it feels like everyone has done way more than me and I'm piggybacking on other people's work and efforts. 

I know I've worked so much on what I've done, but still I face this wall. Mental wall of : How the heck I'm gonna collate all the information in my head into a coherent piece of work. 

How the heck I can make it look like I actually did something instead  of just dicking around for 4 years. 

Can I even add enough information and learn something new to fill in all the glaring gaps in my thesis when compared to what other people have done? 

I feel like a mature masters student rather than a successful PhD student. 

I haven't taken a proper break in the last 6 months. I feel like taking a break is going to ruin the flow, the pace. 

I am very confident in my general experimental capabilities, and yet it feels like things I've done are so unfinished, raw, confusing. 

How the heck can I achieve this and smash it, is all this overthinking just some trashy imposter syndrome?

I'm just feeling a bit overwhelmed by this, i just wanna do my experiments in damn peace. How do I get over this mental barrier? Any constructive suggestins are appreciated :)


EDIT: Thank you to everyone who offered their suggestions and kind words, it has fortified my conviction a bit more. I've got this !!
gpt
First off, don't compare yourself to other students. It's rarely, I'd ever, helpful.

Second, there are two things you can do to help you get momentum writing. First is to plan it out: break it down into manageable chunks, and set some goals. Then, get writing. Only focus on one thing at a time. Pace yourself, build in some rewards, maybe find other people who are writing who you can meet up and write with (many universities have thesis writing groups/bootcamps). You'll be done before you know it.