I kind of understand how you feel. Happy but also sad. I don't know about you, but I think in my case I've been depressed in the past and I've never really told anyone about it (Excluding online) . Due to that I think, I can feel happy when I'm around people, but yet also kind of sad. Kind of like yay I'm hanging out with my friend, but also, I can't tell you the thing that's really on my mind. Also there's the feeling that I'm totally not in synch with friends. Like my friends love street Fighter, and I hate Street Fighter. I love Blazblue on the other hand and my friend would play it for a minute before getting bored. Because of these differences, one might feel alone a bit. I dunno, maybe that's just me.
Also maybe you're just bored, when you say you're full of energy but tired and you also procrastinate often. The way I deal with this, is by having constant breaks between work. So when I draw, (It's enjoyable but also lots of work and tiring due to the amount of concentration required.) I would often draw until I get tired. Take a break as long as I've been working. Then work. Then take a break. So I would draw for an hour, then break for an hour. (Don't be afraid to work for shorter periods of time, like 5 or ten minutes. Just make sure you get back to it in about ten minutes, since five minutes is rather a short break.) Also another way to feel like doing things is doing a physical activity sometime during the day. Like skating or taking a long walk. Once you get your body moving, it's a little easier to get to work. (Or at least it is for me.)