You are blessed with darihaltekehalte, use it.
Let's face it, you're not gonna make lots of 'friends' friends. The best that you can have is 'colleagues that you regularly hang out with'. The faster you accept this reality, the better.
Heck, I am still in touch with my prev managers.
Overtime at the office? Craving something savory? Order Sec Bowl/Eatlah, boom that's 70k-ish gone in a blink of an eye, while a ketoprak might only cost you at 20k the most.
They already have enough things to worry about, like family and mortgage. Them being indifferent is not them being evil to you.
Oh yeah I have zero experience in Jakarta dating scene, sorry.
Tired of malls? There are museums and exhibitions.
Bored of gym? There are crossfit places and even (free) workout communities. Want to learn languages? Go to embassies. New things to do are only a Gojek ride away.
At least for the first 2-3 years of your work from graduation and 6 months into a new office, never eat lunch alone.
I don't care how introverted you are, learn to make small talk in workplace setting. You might not be good at it, but it's a learned skill, so you'll get better at it.
It's useful to dig information and gain new allies.
The faster you can try to put yourself in their shoes, the easier your life will be.
It's the workplace equivalent of keeping screencaps of your dates.
(Hell what do I know about dating lol)
People will never ever give a damn about your emotional state, they only care about your work results.
If your office is more religious (hijraher type), the small talk is 100% about getting bini muda. Oh yeah.