I am not familiar with Kentucky law in particular.
A prenuptual agreement is a contract. It is binding unless it is invalidated for some reason. For example, it might be possible to invalidate a prenuptual agreement if there is evidence of duress or coercion, or evidence that one party (perhaps your husband) was significantly more business savvy and had more resources (esp. legal resources) available to him and took advantage of your lack of knowledge of these things and your inability to hire an attorney of your own to review the agreement before you signed. If your husband had an attorney and you didn't, and if your husband's attorney drafted the agreement and they did not recommend or suggest that you have an attorney of your own review it for fairness before signing, a court might find the agreement to be one-sided and unfair.
It is hard to say without knowing all of the circumstances and without seeing the agreement. Also the laws of your state may come into play. For example, in California, anything over 10 years is considered a "long-term" marriage and the spouse is entitled to a greater share, which is why some speculate Tom Cruise divorced Nicole Kidman just shy of the 10-year mark. Also your agreements with your husband as to how you would share household tasks and such might be considered. For example, if your husband did not want you to work and wanted you to be at home taking care of the home and taking care of him him, he may have a bigger obligation to help you to get an education and/or to help you get back into the job market. Again, it's all going to depend on your specific circumstances, the laws in your state and the specific terms of your agreement. It's not going to be cut-and-dried.
I really suggest you seek the services of an attorney and bring a copy of the agreement with you. Be prepared to show him the agreement and also make good notes about your marriage, any agreements you had with your husband about caring for the home, working, raising children, etc. A good attorney will consult with you at no-cost and may be able to provide you with some guidance. If the attorney believes you require his or her services, he or she will at least give you an initial opinion, tell you whether he or she thinks it is worth fighting the agreement and let you know his or her rates. Generally, you will need to come up with a retainer fee somewhere in the range of $2,500. If the attorney you choose believes you have a strong case, and there is a substantial amount at stake, it will be well worth it to come up with the money some way. In most cases, if your husband loses, he will be required to reimburse you for at least a portion of the attorney's fees you expend.
Also, again, I don't know about Kentucky, but in California a spouse is required to support and care for his or her mate. You may have a case that your husband is not providing you with adequate support, particularly if he is taking good care of his own needs and is not providing for yours.