First of all, please understand that you cannot be 'forced' into signing a prenup. If both parties don't agree, it isn't valid, and you will need to state under oath that you have had an opportunity to read and understand the prenup and have consulted with YOUR attorney concerning it, and you agree freely to the terms of it. If you are uncomfortable, and feel this will 'hurt' you, then you need to not sign.
Secondly, I assume the separate property is designed to be given to his family from a previous marriage? How will it 'hurt' you to 'give up' something you've not had before? MOST prenups will also allow you to keep your property separate, so for example, if you sell your house to move into his, and you therefore don't have a house if he dies or you later divorce, you still have the money from the first house available to buy a replacement. Same with his 401k ... just don't 'co-mingle' your assets and you're no worse off than before.
I guess the real question you have to ask yourself is why are you uncomfortable with all this? Is it the assumption of divorce that a prenup implies? Is it that the money is more important than the marriage? Is it that you feel this implies he doesn't trust you? There are as many different issues as there are people, but the bottom line is you need to decide is: is the 'comfortability' or lack thereof something that points to a problem in the relationship, or a problem with one of you? If the problem is with either him or the relationship, then perhaps the best thing to do is walk away before you get hurt. If the problem is with you, you need to fix the problem, either by walking away and realizing that this isn't right for you, or by adjusting your attitude so you ARE comfortable.
Just don't assume that 'it will all work out' without addressing the issue though! Good luck, and if you have legal questions about the agreement itself, don't hesitate to consult with a Georgia Attorney who handles family law and estate planning issues.