Living this way is not only exhausting but unsustainable. You'll burn yourself out constantly doing things for others and neglecting yourself. This is a time for self care and that means learning to say NO.
Live your life today as though tomorrow is going to come because you need to be responsible and practical but also allow yourself the joy of the day. Don't think you're going to save it all for "one day"...who knows if you'll ever see that day. It's okay to laugh and be silly. It saves my life everyday.