Your plane goes to the right because of torque effects.  Use your rudder to keep it centered on the runway.  (Many joysticks have a twist handle you use as the rudder input.)  If you have no rudder input you have a few options:  A. Use auto takeoff B. Use the a,s,d keys for rudder input.  a is left rudder, s is center, d is right  C.  Third option is to buy rudder pedals or a "twist stick" like the Logitech Wingman Extreme, Microsoft Sidewinder, M$ Sidewinder Precision Pro, M$ Sidewinder Force Feedback, etc, etc.
For now I'd check and see if your joystick has a twist stick.  If not, use auto takeoff.
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bloom25
THUNDERBIRDS