There can be many reasons for this, most have to do with your swing.

your swing - have you had any professional lessons? If you have only been playing for 5 months and have not had any lessons, that is the first place to start.
If you have had lessons and you understand the mechanics of the golf swing, ensure you are transferring your weight to the left side during the downswing. Also, a slide will cause low, short drives. Use your big muscles (legs) to generate the power and smaller muscles (arms) to control the club head. Rotate around your left leg, not slide towards the target. Keep you head behind the ball until impact. Make sure your hands are ahead of the club head at impact.

equipment - the driver you have may not suit your swing. What is the loft of the club face? Is you shaft regular, stiff or x-stiff flex? How fast do you swing?

If you have a video camera, post a video of your swing for the excellent resources on this site to review and comment on.

__________________
Gord

Quote of the month:
"It's easy to see golf not as a game at all but as some whey-faced, nineteenth-century Presbyterian minister's fever dream of exorcism achieved through ritual and self-mortification." ~Bruce McCall