I'm not rich by any stretch of the imagination. But I'm much happier now than I was as a broke ass student.
Money doesn't buy happiness, sure, but it facilitates activities that develop happiness, allow you to live a fuller life, pursue your passions more completely. Travel, a nice house, a nice car, being able to buy things for your friends, family, partner. The value of these things cannot be understated.
Happiness is a complex entity, it is not as simple as having lots of money, but it can be part of the equation depending on your personal aspirations.