I am dealing with forces upto 5N only (handshakes, grabbing objects) so it is not sensitive enough for me.
How much precision do you need?
Do you have any low mass ntc in mind? The one I have tested and am having trouble with is NTC RL3004-291-97-D1
None in particular, anything used with a body thermometer should be useable and since they are disposable sensors (for the sake of hygiene), they're comparatively cheap - perhaps check with a local hospital or a doctor - they may have some leftover that you could get for free.
The only thing that I could find (in a shallow search) was that your NTC is 500 Ohm and has a diameter around 8mm (Remember, linking to datasheets or providing full info of the component in question yields a much better chance of a useable answer).
If it's indeed 500 Ohm (@25°C), it's a bit too low, since it will get lower when heated. I'd go with something around the several kOhm mark, say 10k to 100k, for your app.).
Also, 8mm (and probably a few mm thickness?) is quite a thermal mass, so go with something way smaller.
That said, with a well designed bridge circuit, even small changes should register.
Please provide full data and a schematic of your circuit if you want further help - none of us here are psychics, so we need the input