In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
If missing sahur make you feel you cannot offer voluntary fasting, then it is not to your ability to maintain and you can skip fasting on that day.
Answering your question, Sheikh Kifah Mustapha, the Imam and Director of The Prayer Center of Orland Park and representative for Dar El Fatwa of Lebanon in the US, states:
Yes, you can choose not to fast on that day. This is a voluntary fasting not an obligatory one. All preferred acts or Sunnah are of your choice to practice or drop.
The Prophet (peace be upon him) said: “That which I forbade you off, avoid. And that which I ordained on you, practice to your ability.” (Al-Bukhari)
If missing sahur makes you feel you cannot fast voluntarily, then it is not to your ability to maintain and you can skip fasting on that day.
Almighty Allah knows best.