Strongly, strongy suggest you try out a glass dildo!
http://www.lovehoney.co.uk/sex-toys/dildos/glass-dildos/
I know what you are thinking, because I thought the same thing at the time, (they aren't very penis like and very unyeilding) But really, this glass dildo is one of my favourite toys!
http://www.lovehoney.co.uk/product.cfm?p=11683
If you haven't tried one, then I really suggest you give it a go!
I'm quite petite down there myself, and I find most dildos are just too big for me. I used to use (still sometimes do) use a vibrator that is realistic shaped but not have the vibes on. I keep the batteries in it to give it some added weight and it works really well, but Lovehoney don't stock that vibe here. This is very similar though. (it might be the same actually...)
http://www.lovehoney.co.uk/product.cfm?p=12533
But most of these are going to be smaller than your average dildo and may be more comfortable.
http://www.lovehoney.co.uk/sex-toys/vibrators/realistic-dildo-vibrators/page-all/
There is this dildo from Doc Johnson. I have the Ballsy vesrion of it which is slightly girthier, but this one is a little smaller at 5 inch circumfrence. I can just about get the ballsy version in which is 5.5inch but I think 5 inch would be more comfortable. But it is made out of a UR3 realistic feel material, and when it is warmed up it feels really good! When it fills you it does feel quite real. Certainly something worth considering.
http://www.lovehoney.co.uk/product.cfm?p=2051
Hope that helps some. xx