That's a false belief, how do you know you can't after one month? There are many people here who prove that it is possible. What makes you different?
Most of what will get you 90 days and beyond have to do with beliefs (and limiting beliefs). Do you believe that you HAVE to give in when the desire becomes great? Because you don't. Do other things. Don't throw gas on the fire and you won't have to deal with raging desire. Leave that part of yourself for the person God has prepared to be with you.
Instead of seeing it as 'oh I gotta abstain for 1 month', look at it from a different angle 'today, I will not PM'. Eventually it will add up slowly and surely. One day at a time!
I started for the first time in OCTOBER 2nd 2018 and here I am on day 34. Anything is possible when you put your mind into it.