If you experience discomfort when wearing the contact lenses, there might be some deposits or debris (dirt) on the lens, so start by rinsing it with liquid lens solution (never with water).
Alternatively, please soak them in a fresh solution and let them sit for more than 24 hours.
It could also be that the lens is inside out. Before putting the lens on, hold it on your index finger against the light. It should be in a perfect bowl shape.
If this does not solve the problem, you should stop wearing them as they could damage the surface of your eye and seek help from your eye dr or optician.