Trying to make flight/gliding controls

I’m trying to make a controllable paper airplane using physics but am struggling a lot.

I made this so far:

I’m trying to make a lift effect on the plane but I’m pretty sure I’m going about it wrong. Right now the plane will glide forward and I can make it go up or down by controlling the pitch.

however, things start to go wrong when I try turning as you can see.
2019 03 10 02 15 36 - YouTube the yellow thingy represents the velocity

I found this while searching around and it looks like just what I need but it’s for unity and I’m having a hard time understanding the code. Unity 3D: Mouse Flight Controller Source Released - YouTube