Are you referring to "backpacking" as budget travel or (the American meaning) as wilderness trekking? This site is primarily devoted to the latter activity.

If you are referring to "backpacking" as budget travel, a lot of us here have traveled, but you will probably get more information on a site devoted to it such as Lonely Planet.

That being said, most of my overseas travel has been alone, and I enjoyed it a lot more. I found it particularly frustrating when I did travel with friends and family in countries where I knew the language and had to spend most of my time translating! You will meet plenty of friendly folks at hostels and such places; often you may get together with some of them for local excursions. So it's not as though you're alone all the time!

If you do contemplate wilderness trekking, see the above posts!