I graduated with a bachelors in computer science around 4 years ago. Long story short, I was depressed, dysphoric, and suicidal throughout my college years and by the time I finished I didn’t want to do anything. I’ve been unemployed for the last 4 years but I’ve also transitioned, started taking better care of myself, and overall I feel much better.
Anyways, I need to get a job now. What kind of lies can I get away with on my resume to cover up the long period of unemployment? Should I pretend I started some sort of company and it failed? Pretend like I went on some backpacking journey in a foreign country? Do companies even check all this stuff?
I did do an internship at a big tech company several years ago, and I’m working on personal software projects so I can put that on my resume. Also, I’m in Amerikkka.
Sorry if this question has been asked here before 
I don't think my situation quite compares since I've never been unemployed for long periods of time - my time while unemployed was usually interspersed with brief periods of employment that I usually quit or got fired from. However to cover up periods of unemployment I would extend whatever job I had forwards or backwards in time to cover up my unemployment. If you really have zero employment for the past 4 years, you could also use volunteer work. Again stretch it out, make it seem more important than it actually might've been. I at one point had a period where I was involved with food not bombs on my resume as volunteering for a big food bank in my city that most people had heard of. It might not be employment, but it would be something to talk about - although employers would prefer to see employment, they know sometimes people are looking for jobs (esp. after college), but they do like to see something.
I usually try to have my lies based in some fact, but if you have no volunteer experience either, you might be able to make something up. But also, the fact that you graduated relatively recently helps, since as I say many people don't get a job right after college. Many people travel - you could say you did some traveling, a bougie company would love to hear that. Also 4 years ago - did you graduate 2020? I think Covid would be a good enough excuse for why you didn't have a job. Say it was the middle of the pandemic, couldn't really find anything, but instead you chose to work on personal development in the form of personal software projects. Also the internship would be a perfect thing to stretch out (unless it was during college, in which case it might be a little tough).
As someone brought up, the big fear with lying is that companies might check. Large companies are most likely to check, but you can usually request a company not to contact someone. Usually you need 2-3 references. I've been lucky in the past I've had enough coworkers to use for references (of course sometimes they request that at least one reference is a supervisor - I usually pass off one of my coworkers as being one level above me). Sometimes you need to get creative with references. Friends also work to lie, though I don't have experience with this.
Also definitely play up your skills. Not so much that they think you're able to do things that you're not of course, but do make them seem a bit more impressive than they might be.