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@yoav
If the old pedals came out easily then the chances are that the threads were ok before you tried to insert your new pedals.
Before you involve the services of a bike shop, try this: clean out the threads on the cranks and pedals really well. Now apply lots of grease to the pedal and crank threads. Examine the pedal axles carefully: just out from the threads, will be a mark "R" or "L" (right and left, obviously). Right is from the rider's perspective i.e. the drive side crank. Gently screw in the pedal by hand (clockwise). Will it go in? If it does, gently screw it all the way in. If you meet resistance, stop and try again. If you manage to get it all the way in then check that the pedal is sitting straight and turning freely. Now try the left but turning anti-clockwise.
Hopefully, you have just buggered up the first few threads of the crank rather than the whole thing and the pedals will hold. Otherwise, I'm afraid it is a bike shop job.