All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
First of all, praise be to Allah who guided you to Islam and we ask Him to grant you success and to expand your chest and open your heart to Islam.
You should know that you were wrong in carrying out the DNA test in order to verify whether or not you trace back to your father. Not looking like your father is not a justification to challenge that you are his descendant.
Abu Hurayrah narrated that a man from the tribe of Fazaarah came to the Prophet and said: “My wife has given birth to a black boy.” The Messenger of Allah said: “Do you have camels?” He said: “Yes.” He said: “What color are they?” He said: “Red.” He said: “Are there any gray ones among them?” He said: “There are some gray ones among them.” He said: “Where do you think they come from?” He said: “Perhaps it is hereditary.” He said: “Likewise, perhaps this (i.e. the color of his child) is hereditary.” [Al-Bukhari and Muslim]
In principle, the child is traced back to the owner of the bed (i.e., the husband) and it is not correct to rely on DNA test in denying lineage to the father. The only Islamic way in denying this child's lineage is by Li’aan (refer to Fatwa 193277).
The decision of the Islamic Fiqh Council at its sixteenth session on the genetic code reads: “It is not permissible in Islam to rely on DNA code in the denial of descent, and it is not permissible to put it in priority over Li’aan.”
Therefore, you should not tell anyone about the result of this DNA test and the principle rule remains in that you are traced back to your father.
Allah knows best.