Don’t compare your actual self to a hypothetical self.
Don’t drown in a sea of ‘what if’s.
Don’t clutter your mind by imagining other versions of you in parallel universes, where you made different decisions.
The internet age encourages choice and comparison, but don’t do this to yourself.
‘Comparison is the thief of joy’.
You are you. The past is the past. The only way to make a better life is from inside the present. To focus on regret does nothing but turn that very present into another thing you will wish you did differently. Accept your own reality. Be human enough to make mistakes. Be human enough not to dread the future. Be human enough to be, well enough. Be honest while appreciating or asking forgiveness. Accepting where you are in life makes it so much easier to be happy for other people without feeling terrible about yourself. (Not my words)
That’s your answer to “HOW TO BE HAPPY!!”. Being happy is easy & simple. Life is fun, let it be.