Ok...no one replied to your distress signal, so I'm here to save the day.
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Lately, I've become less social than I should be, stayin inside instead of going out.
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Yeah there are times I feel the same way, where I don't feel like going out or anything, but it's up to you to change that! Call your buddies up (whether it's all guys, all girls, or a mix) and plan something out, or simply go out there on your own and get some #'s!
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I need help on how to befriend more people and get invited to more parties.
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Befriending people shouldn't be much of a problem. If you work on your social skills, or if your social skills are good as it is, you can make friends just about anywhere (my personal belief). As for the parties, it's up to you man. Either get friends to find out the latest parties around or start one of your own.
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Also, it would be nice to be called to go out every so often. I'm at a slump right now and need some help on becoming more social.
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It would be nice, but seriously let me tell you from my personal slump days, that if you wait for someone to call you to go out, chances are, it usually won't happen. Make the plans yourself, I can't stress that enough. If you're hungry, it's your job to go down to the kitchen and make yourself something to eat. The food won't get up and go to you and fix itself into a meal.