I found this website years ago and am glad it's still around. It's got a lot of info. about the female g-spot.
http://www.libchrist.com/sexed/Gspot.html
If you slide a finger or two (my middle and ring fingers together on my right hand are what work best for me), I can feel a less smooth/more bumpy kinda area just about an inch or two in and that's where my g-spot is. It is much easier to feel the more turned on I am because it swells up. When I first discovered it I found that reaching g-spot orgasm happened usually after a long period of being really turned on but not having had an orgasm, then it would just take a few strokes of the area before I started to feel the wave come over me which would lead to intense orgasm. Also, instead of clenching your ******* muscles inward, push out kinda like when you're giving birth, you may have more luck finding it that way. When you go to pleasure yourself, leave your clit alone, instead try using a little vibe on your inner labia instead. For internal stimulation, follow the ideas mentioned in the website above.
Good luck! I hope you find yours. Like I said in the other thread, it wasn't until I was in my 30's until I found mine.