How do you all get yourselves to go out/get excited about going out?

I always make excuses to stay home during the week. Once I'm home from school/work I don't like to leave again. I assume it's just become habit but I really want to break it.

I've also noticed, and I think my friends notice too, that I am always the least excited to go out on the weekend. How do you all pump yourselves up to go out and have fun? I try to tell myself "JUST DO IT" but that's usually not enough to get me in a social, go out and have fun mood.