Happiness is not a destination (e.g. I’ll be happy after I get married, after I have a child, after I have a better job, after I have top marks in my exam) but rather a state of mind. This is what Islam teaches us.
Happiness already exists within you: not outside of you. Use Islam, and the guidance sent by our Prophet SAW to tap into this happiness. Seek Happiness from Allah not from the Dunya.
Imagine having a mindset so strong, being so in love with Allah that you are content with merely the oxygen in your lungs, and the alhamdhulillah on your tongue. If you can achieve this level of contentment, nothing, and no one, can rob you of your happiness.