I would think twice about your instructor if he sais the plane is junk and cant fix it....

I would question his eperience if he cant trim out a plane...on the ground or in the air...its just as important...i found on mine...the rudder at nuetral was a little off..so i fixed it...and the front wheel was off a little too...so i fixed it too...

No plane, kit or rtf is ever going to be great on its first flight, every plane has its own character and has to be adjusted for it...after the first takeoff, your instructor should have straigtened her out...and if he couldnt, he should have never given you the controls on takeoff...