From an external viewpoint, (watching the object go by), mass increases as speed increases, and time slows down. - The same force produces less accelleration.

From a internal viewpoint, (inside the moving object), you might believe that you've exceeded C as you get there 'quicker` because your time has slowed.

In relativistic thinking, stick to one 'observer`.

Because it is a 'assymptotic approach` situation,
(1/2, 1/4, 1/8, 1/16....) your exterior observed
time rate approaches zero, but never gets there,
as the energy required to accellerate, increases,
as your mass approaches infinity at C.