I try using my fingers but doesnt seem to go deep enough for pleasure

Going deep enough may not be the issue.  Are you massaging your clitoris? The clitoris is actually much bigger than it appears, most of it is below the surface.  Part of it is often referred to as clitoral legs because of the shape and how deep they extend.  When fully aroused, the legs can be stimulated from within the vagina.  Other parts of it can be stimulated from the top wall of the vagina.

There are locations inside the vagina that provide a great deal of stimulation for many women.  The G spot is one such spot but it is not the only one.  It would be very beneficial if you research about your anatomy and how it functions sexually.  This knowledge can lead you to some incredible sensations.  There is a lot of information on the net but they are not all equal.  Choose your resources wisely.  You might try searching for terms like: G spot, female prostate, urethral sponge, and clitoral legs among others.

Of course, there are also many women who like a fuller feeling that fingers cannot provide.  If this is the case, you may need to look into "sex toys" which can provide this.  I would not recommend this without understanding what is involved.  I would try learning better stimulating techniques first.

I guess I should have asked, are you a male or female?  Obviously the answer is going to be different if you are male.  If so, then we need to discuss the prostrate gland specifically.