Alright. I said I wasn't gonna get into any of this anymore, and it looks like I failed on that.
So let me cut to the chase.
Please, stay on topic.
I've been trying to go over what you want out of your story, and I had to legit copy&paste before CUTTING OUT a lot of your replies in order to understand what you were getting at. And a lot of the stuff I omitted dealt with your personal business.
I do not want to know about your personal business.
I am a stranger on the internet who is not close to you. I shouldn't be hearing about what happened between your ex-friends, your ex-girlfriend, nor should I be hearing any of the personal business you give about those people.
The stuff you said about your mother should be kept PRIVATE.
You're giving way too much information, and you're kinda lucky that a lot of the people here are telling you this and not being outright hurtful.
That being said, let's also get to another thing:
I can't tell if you're blurring the lines between fiction and reality or not.
Look. I'm gonna be honest. I have made stories that have been loosely based on my own experiences and feelings. I have made characters that represented a part of myself or a part of the people I've known. But never have I:
A) Made it an obvious representation of myself or of the people I've known.
B) Told anyone that it was based on people I know or me.
The key word is "loosely".
Because I know at the end of it, none of what I write will ever represent or speak about myself or the people I know. There may be feelings there, but that's it.
You, on the other hand, are claiming to make yourself into the main character, people you know into the main character. You can't be doing that -- it makes it harder for you to take criticism, and quite frankly, you'll be giving out information some of these people don't want given out. You're still not understanding the idea of "boundaries".
Now, to answer your question -- Yes, you can make a MC that's a jerk.
But your problem is that you're not making a story. You're essentially making an auto-biography and oversharing a lot of stuff you shouldn't be sharing. That's my thing. There's a time and place to do so, but for what you're going for, I don't need all of that information.