Q:

“Is it considered Zina if my boyfriend and I masturbated on video call before I started wearing hijab?”

A:

Yes. It is considered a form of  Zina. The Prophet (peace be upon him) said, “Eyes commit fornication; fornication of eyes is lustfully staring; mind fornicates; fornication of the mind is lustful thoughts; the private consummates it (by taking it to the next level).” So, you have fornicated by masturbating on video chat. You ought to seek repentance and ask forgiveness of Allah.

On the method of repentance, you may refer to the answer linked below:

The Door of Repentance Is Wide Open

Almighty Allah Knows best.