It's fine to start being tighter with your money: being thrifty right now is wise. Just don't let the idea of saving every single penny take over your world. Obsessions of any kind are not optimal, but an obsession with saving money could alienate you from other people. Just as you have to invest in your financial health, you need to invest in your social health. Don't bow out of festivities just because doing so can help you save money. You can still have fun without breaking the bank.