Might it be torque spinning your plane? During takeoff, as you rolling on runway, your plane will be turning to one side. Make sure to apply needed amount of opposite rudder to keep your path right. Don't apply a lot right away, do you it slowly or plane will drop the wing and you'll crash. Also right after you got airborn, immidiatly apply left(right) pressure on stick to counteract torque effect which makes your aircraft to suddenly roll to one side. As you gain speed, control will get much easier.
Hope this helps,
mx22