A question for you, 3-and-0---is it possible you're throwing too hard or overthrowing? That could account in a big way for your problem in finding the strike zone. Also, what arm angle are you using? If you're throwing over the top, that could be part of the problem---I wonder if this is indeed your natural delivery, or whether you were told to throw that way. You should stop and take a long hard look at your mechanics and see if anything's out of whack, and if so, do something to correct it.
I've seen a lot of pitchers who sometimes give up a lot of hits, or give up two or three---but they don't walk anyone. Conversely, I've also seen a lot of pitchers who give up maybe one hit but who walk the ball park---and somehow I don't think you want to do that. 8)