You are not going to be the only person appearing to come from that IP address – many will likely be NATed through it.
The more significant concern is if you are the other side: if you deliberately run some sort of VPN or other proxy that others can use, or less deliberately do so. Many hacked or otherwise suspicious browser add-ons, and other malware, will make HTTP(S) requests & other connections on behalf of their C&C hosts and to your ISP or anyone else those requests will be largely indistinguishable from those that are the result of your activity.
The more significant concern is if you are the other side: if you deliberately run some sort of VPN or other proxy that others can use, or less deliberately do so. Many hacked or otherwise suspicious browser add-ons, and other malware, will make HTTP(S) requests & other connections on behalf of their C&C hosts and to your ISP or anyone else those requests will be largely indistinguishable from those that are the result of your activity.