How to get my brother to actually do something?

He never does anything. My life has been really dull lately because everyone in my family is on the computer. Up until I was about 10 (I'm 13 and my brother is 14 now), my brother got addicted to the computer. He never gets off until supper.

He also refuses to do school a lot of the time. We're both homeschooled. When he is finally forced to do school (about every day) he just keeps giving loud obvious sighs as if he shouldn't even have to do it.

We used to jump on the trampoline and stuff and play games and at least be outside, but I don't really even feel like I have a brother anymore. This has been going on for basically 3 years now. I also have a neighbor who is one year older than my brother (me and my brother have known him basically forever since he lives next door), and he comes over to my house and expects my brother to at least get out of the office, which is where the computer is. He doesn't even say hello to him or anything.

This is starting to bother me a lot. My brother who is 21 is gonna be moving out in a few months, which is gonna suck pretty bad if my life just goes on like this. Does anyone have any ideas on how to get him to even get out of the office or something?