Is it normal that i never leave the house?

First off I'm a 21 yr old guy and I might sound like a loser after typing all of this but here it goes.

I rarely leave the house unless I go to the store or school.I quit my 3rd shitty job of 8 months about a month ago.Most people there didn't like me much and neither did I.I don't have much friends to chill with other than my childhood friend that lives down my street which I rarely hang out with since I feel like a loser compared to him(hes outgoing,has loads of friends,etc) and my drug dealer which I buy weed from but also rarely chill with him since I don't want to end up like him smoking weed all the time and a dropout from college.The only social interaction I have is with ppl at school but other than that I'm a complete loner.Its taking me 3-4 yrs to graduate from a 2 yr college since I dread graduating and not finding a job afterwards.In the meantime I can at least tell family members and ppl that I'm busy with school and not come off as a loser that sits at home all day.I spend the majority of my time in my room, in front of a computer screen playing quake live.How sad is that?My lack of social life prevents me from getting gf.I'm not bad looking at all and if you were to see me in person you would think I have it all but I don't.I feel like I have nothing going for me.I feel lost in this big world.To top it all off I have social anxiety which makes everything 10x harder. Finding and keeping a job is hard for me.I don't know what to do anymore,hopefully someone can relate or give advice.

/Rant over