Im a male, turning 30 soon, single. As i dont really have a social life, I have managed to amass a total of cash savings of $100,000++. But im still unhappy and mildly depressed. Is it normal? How can I find joy in life?

If you are sucked into your own emotions, it is easy to remain depressed, reach out and help others, that may help you find meaning in an otherwise meaningless life

Given such low interest environment, having such amount of savings in cash, if without any specific use in the near future, is unlikely an efficient way of savings.

But the more important issue here is you are unhappy.

From what you described, it seems like money can't buy happiness. But having many personal experiences of much joy from the use of money, I do think that money can buy happiness. And such happiness is always because money is spent not for myself but for others. And it is usually doesn't require much money to do that.

Some examples that money bring me great joy even after many years -

1) I used to buy a lot of food that I can't finish from the school canteen because I notice some poorer students are not eating during recess. And I happily let them make fun of me being an idiot during my school years.

2) During my last vacation in Greece, I would pass by this 4 to 5 years brother and sister who sang so horribly by the street for money. I would bring them to get ice cream and they would teach me how to sing as horribly with them as we finish our ice cream. On the last day before I left. the kids' mom asked for a cigarette. I gave her 2 packets.

Later, 2 older ladies came up to me and told me that they have been watching me and have recorded what I was doing. They said they were going to report me. I guessed they thought that I was a pediophile who have just bought the kids for 1 packet of cigarettes per child. So to help these ladies with their efforts to put such sickening dirty old man behind bars and away from harming innocent children, I asked them to give me a minute to go get my passport for them to take picture when they make the report. Unfortunately, they didn't want to wait. I still can't stop laughing about this experience now.

3) When Covid-19 first started, I bought tons of face masks. I couldn't get hand sanitizer. I googled and paid a couple of workers around my apartment and started a mini factory bottling my homemade hand sanitizer. I gave my Covid-19 pack to some older people that I know, sold for some at work and donated those money to another colleague's charity work, and gave the rest to whoever wanted.

These are the happiness I bought that have not allowed me to stay depressed for long during the bad times of my life.

See if you want to try buy some happiness in ways that appeal to you.

If still feeling down, do consider getting professional help. We tend to overlook our mental health.

Hope this help.

Amazing build up on your wealth! At least one thing less to worry. I guess you can find something you enjoy, be it sports, investment, nature etc, you can find people with similar hobbies on meetup.com expanding your social circle as well. Don't coop yourself up, a fresh perspective always does wonders.

I would suggest u to get some social life. U can start with some meetup activities like sports to expand yr social circle. In fact, many social activities do not require u to spend a lot of money.
As u r still young and already have mild depression, u might want to start to improve the situation before it get worse.
Health is yr number priority. Without the health, u fun hv chance to enjoy yr wealth. All the best.