Let me get this first, Let me get that. The problem is we rely too much on the things that we hope to get to make ourselves happy. It's ridiculous.

If my happiness depended purely on the car I Just got, Then I would be happy for the first time in 24 years.

Be content with what you have already

Sometimes it's hard to be happy when we feel as though we have so little. But what makes us think we'll be happy when we have the things that we have been wanting?
If you have the brand new clothes, and all the groceries you wanted, You May feel happy at first, But then that happiness will quickly fade, leaving you with the sense of emptiness.
You have to be happy with you, and what you already have.

Even when your life sucks, Whether you go through something bad, It's still possible to be happy despite those problems. You just have to make the conscious decision that you are going to be happy anyways, and that's not something that will bring you down. That Is a struggle I've had recently after my 6-year relationship ended. While I did everything in my power to make the relationship work, He had become so so selfish and wasn't willing to compromise with anything. That he was willing to sacrifice everything that I've ever wanted in life so he could have what he wanted, Which also involved me.
At this point, I made the conscious decision to be happy without him. To make my life the way I want it. Sure, I can't have every little thing I've ever dreamed of, In this exact moment without any effort. But I can focus on all the wonderful things I do have, And use those things to make me stronger.

Intentional Activities

Sometimes we are abusive to ourselves, Sometimes we abuse our bodies with unhealthy food and sugary drinks. We drink alcohol, or we flat out refuse to exercise Most of us have some behavior we aren't proud of, And it's hard to feel happy when you aren't feeling well, that's why it's important also to make an effort to take care of yourself. If you are dying for a personal day to get yourself back on track mentally, Take one.
If you need some extra sleep or water Give it to yourself.

Happiness Is A Practice

You can't master happiness overnight. I remember back in the day when I was a negative person. It took a while to get to the point where I was more focused on the positives in my life over the negatives. Happiness is part of what you do each day, How you think, & how you take care of yourself. Over time you can become happier by making more changes in your life that will get you there.

Conclusion

Happiness is something you can decide to have, and the logic that you'll be happy after some event happens. It's bad, And you are going to fail. While if you focus on what you do have now, And use that to be positive and take care of yourself. You are more likely to have a happier life.