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:
There are enough challenges when it comes to conversion to Islam. So make it easier for yourself by not telling your family about your conversion to Islam right now.
Answering your question, Sheikh Mustafa Umar, President of California Islamic University, states:
First, we would like to welcome you to the fold of Islam. May Allah the Almighty help you pass this transition period successfully.
It is permissible for converts to hide their conversion to Islam. In some cases, it is even encouraged to hide their Islam. This is when conversion to Islam will cause harm to them, especially in the beginning where they are getting accustomed to being a Muslim.
Challenges of Conversion to Islam
There are enough challenges when it comes to adopting Islam. So make it easier for yourself by not telling your family right now.
You can tell your family about your decision of conversion to Islam later when you are more independent and stronger in your faith.
We pray to Allah the Almighty to accept your good deeds.
Almighty Allah knows best.