system
Given the following post, respond as if you're commenting on Reddit:
human
When in space, can you not be orbiting anything and just float around?

My knowledge of orbit mechanics is not very thorough...
gpt
There will be most likely something that you orbit around. 

If you go fast enough (11.2km/s), you can leave earth's sphere of influence, you then fall into the sun SOI. If you go even faster, like Voyager (which had to go faster than 617.5 km/s.) , you can leave the sun's SOI and orbit the milky way's center. (Voyager is now cruising at 17km/s as of 2013) 

At that point, you would really need to go fast and for a long time to leave the milky-way. Imagine for a second that we succeed, we left the milky-way, and the local group. We are now going around the great attractor. 

So in the end, yes you will always be orbiting something, but at that scale, you would not be able to notice by eye that you are in orbit and it would be like you are just floating around. 

Edit : forgot a period . 17 000 km/s and 17.000 km/s are 2 different things. 

To clarify, Voyager is now going at that speed, but in order to escape the SOI of the sun, it needed to have a speed superior to 617.5 km/s. Velocity that reduced as the spacecrafts distance from the sun grew.