Is what I'm feeling normal?

A little bit of a background check, I'm in my mid-20s living in Kathmandu solo in a flat, have been working in IT with a decent pay for the last 4 years, have been working out consistently in the gym for the last 3 years, come from an upper middle class family who live outside the valley and I don't have to send them money. The money that I earn is enough for me to live comfortably; I invest, buy things I want and save up. I mostly read books and play single player games in my free time.

You would think I have a pretty good life with not much to worry about, but I have been feeling down in the last few months. The problem started when I broke up with my girlfriend 6-7 months back. Prior to that I was a carefree guy who was optimistic about life and what it had to offer. I was even fine a few months after the breakup where I just adopted the "red pill" philosophy and concluded that the problem is with others and I am progressing in life and that I will eventually find someone who is suited for me.

But I feel broken now. I imagine what her and I used to do together on random occasions. I can't be vulnerable with anyone. I only talk what is required of me at work. I can't trust anyone with what I talk to myself with. I feel difficult to reach out or ask help about the most mundane things to my closest friends or my family and just talk. Going through a crazy impostor syndrome which stems from all my friends/relatives either getting married, getting jobs with better pay, going abroad or heck just have fun. I want to isolate myself when I'm in a social setting, but feel like I'm missing out when I'm just isolating.

Is this a mid-life crisis? Do you guys feel the same way?