not really, but someone who really knew what they were doing might be able to mess with you. IP addresses are hardly related to just you. Especially since most internet providers use DHCP (dynamic random ip addresses) your computer will most likely have a different IP within a week anyway. Even if you never shut off your computer and it always has the same IP, most likely noone is going to bother unless you've made some enemies here and someone specifically wants to target you. Otherwise there's no reason they would go after just your IP address. Regardless there are many ways to discover IP addresses even if there are not listed on a public internet forum.
Always use a cheap NAT box (companies like linksys/netgear call them firewalls) and you'll be more than protected.