Whenever I gliss (slide across the keys) , It hurts, alot. So much that I end up stopping playing.
What should I do?

thats wierd.... use the top of your hand and try to use mostly the top of your nails( use mostly your first 2 fingers).... if you already do that... maybe your using to much pressure. does it hurt your fingers or your wrist?do you slide more towards your pinkie finger?if you give me more details im sure i can help reply back or email me at jen_a_n@hotmail.com
Jen

yeah, glissando can be a painful thing for your fingers ... just do what I do .. Use your tongue !!

uh, dont really try that ...
Ive been playing piano for about 23 years (since I was 6!), and its just one of those things that you just have to adjust to ... in time, you`ll get it!

Thaks guys! I tried out what your said and it doesn`s hurt anymore!