2nd year poly student here, i realised i've been spending a lot on social life. I want to start investing, should I cut off 100% of my social life and just stay at home and invest these money instead?

Yes research tbills

Cut back, not cut off - I used to spend 50% of my income on social life but i didn't regret it one bit (pre-uni days). Once i started actually working, i save 50% of my income till date.

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Spend money on experience, and save the same (or more) for the future!

Hey there! Cutting off your social life by 100% might seem a bit extreme. May I suggest you begin with baby steps - https://www.sevendollarmillionaire.com/1-baby-s...
 
I found this quote very useful in the article:

“Done right, saving money is more fun than spending money.”
 
I think you should take the smallest, easiest, most simple steps you can, while slowly transitioning to the lifestyle you want to achieve.
 
Since you may have turned 18 already this year, you can consider Hugo Save too. It is a digital account that helps you spend, save & invest, starting with gold. If you are keen, you can download and try the app here: www.hugosave.com
 
1. You can open your account in under 4 min. All you need is your NRIC/ FIN and a selfie. It's open for users above 18 years of age.
2. The Hugo account comes with a Visa Platinum Debit card that you can also use on MRT or buses.
3. With Hugo Roundups, your purchases get rounded up to the enarest dollar and the loose change is auto invested into gold.
4. You can actively save for your financial goals through Hugo Money Pots.
5. Start your investment journey in gold through Hugo Gold Vault. With Hugo, you can invest as low as $0.01 in gold. I love the fact that Hugo makes saving and investing a habit and not a chore. It has helped me save and invest a little every singe day.
 
I also love the fact that Hugo makes saving and investing a habit and not a chore. It has helped me save and invest a little every singe day. Hope this helps! :)

I used to think like you in the past cutting down on social life , saving money. But I realised something, i miss out a lot on the ability to build network which is one of the most important skills to have in life. You will thank me later when you are an adult.

when we are too frugal it affects us mentally over the long term. Learn to spend wisely, not in extreme ways.