I keep chasing bad pitches and hitting grounders...

The grounders is also a big problem.. although I hit them hard, I hit the ball on the ground almost every time and it is always fielded.

Two things, if you work at keeping your weight back you will have a better base to make late adjustments from, also keeping your weight back may also provide loft.
It sounds like you may be hitting off of your front foot, committing early and because you are out front you are unable to lay off and hit on the ground.

Do you use the "hit the top of the ball" cue and the 2 tee drill?

Have you reviewed a video of your swing? Are you using a hitting instructor?

I agree with Swat. Have someone help you. They will help see what you are doing. A video may help too. I think plenty of times hitters try and fix things on their own, when sometimes they cannot.

Stay positive and do not give up. It may only be a slight adjustment.

Good luck,
Lefty

To floridafan, I know that is not the problem because I make sure to always keep my weight back and hit off of a stiff front leg.

Are you swinging at pitches that you feel you can drive? Or are you swinging at pitches that you are fooled on?

I am talking in hindsight, are you analyzing your at bats?

I know most of the above posts have dealt with the mechanics of the swing and ground balls, so I won't answer that. Let me ask you this.

Do you have a hitting philosophy that is unique to you?

In other words, a plan of attack that is centered around your strengths as a hitter. Once you've got a plan, then you can work on changing your pitch selection that fits your strengths. Good mechanics and bad plan rarely work out very well.

If your plan up to bat is simply, "get a good pitch to hit." Then it's time to define what a good pitch is to you. The video below will show you how to develop your plate philosophy. I picked it up from Ted Williams' book and simplified it a little bit. Without a plan, mechanics matter little! Hope this helps. There is a brief into to the clip, just skip past it if you want to get to the meat.

Hitting Philosophy Video

Nate Barnett