I remember I used to be present up until I started using drugs and then also developed PTSD traits from a life threatening experience.
Being present means happily observing your surroundings, if you were waiting at a set of lights or in line somewhere or just relaxing.
You could say anxiety is worrying about the future and depression is being stuck on the past (although not entirely true).
You can force yourself to be present minded through meditation, rewiring your brain so you are present minded most the time naturally.
I have been meditating now for 2 months and my sessions get better and better, I just meditated for about 40mins and I have noticed I dont worry so much anymore, I am slowly going back to my old self of being in the present, and I am generally happier.