I just need to stop making excuses.
YES YOU DO.
I'm tired... sleepy-tired in fact. Guess where I'm going in a half hour? The gym. Who am I going with? Myself. I'm not in "the mood" but I know that I will not regret leaving the gym tired as opposed to putting off exercise. You only have so much time here on planet Earth, I suggest you utilize every possible moment.
It's a luxury to have a friend support you in the gym but it can hinder your progress as well. Say your buddy can't make it; you shouldn't blow off a day because someone couldn't join you. No one will hold your hand and if they do, they're preventing you from two fist-fulls of "**** You Old Me". Pick whatever gym works for you and go ASAP. There's people there who can spot you if you need it. Some are annoying meat-heads who won't shut up about how you're doing whatever wrong and some are genuinely nice and helpful people.
At any rate, get some headphones that won't back out when you get sweaty. Start whatever workout it is that you have in mind and push yourself. C'mon, I know you got it in you!