Read your contract
If you need legal advice, consult an attorney. This is not legal advice.
There are options:
1. If you have decided not sell: Ask your Realtor how they can help you. Most Realtors rely on referrals, so they will help you work out an arrangement that is workable
a) If it is a temporary decision (until you do something) - the listing can be placed on HOLD and not marketed.
b) If you have decided not to sell, perhaps the listing can be Withdrawn. That means the listing agreement, is in effect, but the property is not for sale
c) If you have decided not to sell and can convince them...CANCEL the listing. The REaltor's broker will need to sign off.
2. If you have decided to list with another Realtor....could be more complicated.
3. If you plan to sell without a REaltor (without professional representation), good luck.
In most cases if you really have decided not to sell, something should be able to be negotiated.