It's quite difficult to be happy in the present when you're worried about the future, or trying to control it.
You can't control the future.
At least not directly.
But you can pave the way toward the future that is most pleasing to you by perceiving the present as clearly as you possibly can - by paying attention to what you are doing, thinking, and feeling.
Living in the present is a matter of remaining aware of what you are doing, thinking and feeling. And everything else then becomes clear.
Your circumstances, the events of your life, are the extension/translation of your inner experience. And when you are paying attention to that inner experience (i.e. what you are doing, thinking, and feeling), you can see the connection. And you can gradually take responsibility for that inner experience (and consequently the outer as well).
But the key is to pay attention to what is going on within you. That is where it all starts. Everything else is a consequence of that inner activity.
And when is that activity taking place?
In the present.
So pay attention.
Live in the present, and the future will then take care of itself.