It is not permissible for you to not fast in Ramadaan if you are a person who is required to fast, unless you are a traveller or are suffering from an illness with which you do not have the strength to fast – according to His Statement, the Exalted:
So whoever is ill or on a journey, the same number (of days of missed fasting) must be (made up) from other days. Soorah al Baqarah (2) aayah 185
And He has not placed upon you in the religion any hardship. Soorah al Hajj (22) aayah 78
Allaah does not burden a soul beyond its capacity Soorah al Baqarah (2) aayah 286
And according to the statement of the Prophet sal Allaahu alaiyhi wa sallam:
If I command you with a matter, then do as much of it as you can.
And with Allaah is the tawfeeq. And may peace and blessings be upon our Prophet Muhammad and his family and his Companions.