The Happiness Problem

What do you do to make yourself happy?
Believe it or not, I have heard this a bajillion times. And though "bajillion" isn't a word, I wanted to emphasize the fact that I have heard it a lot. Like... a lot, a lot. My therapist asked me every time we had a meeting, my grandma has asked me it, and my significant other has asked me it - friends, families, concerned teachers, etc. I usually give generic answers such as hobbies of the time period asked, or sleep (sleep always makes me happy) sometimes I would say food (because who doesn't love food, right?). But I never gave, like, an in depth answer as to what makes me happy. Maybe it's because I don't really know. I used to be able to say that singing makes me happy, but I don't really get to do that a lot now, which is understandable with two roommates and paper thin walls blocking myself from neighbors. Writing was a hobby that I would love to pick up again, but with homework, mid terms, finals right around the corner, time for my boyfriend, time for my family and chores... well, writing a big long story (like I really want to) is just kind of out of reach. Music tends to make me happy, but really when i think about it I only listen to music on my way to classes, so maybe about 20-30 minutes a day am I just bobbing my head to some smooth tunes, with a genuine smile on my face.
Smiling. It's sad, but, since moving to college I have literally mastered the art of a fake smile. I can crinkle the area next to my eyes, paint a sparkle on my pupil, and smile like a pro - but the smile that I am giving people is such a lie.
To be honest, I'm happy when I hear my grandma's text tone (Rue's whistle from The Hunger Games, 'cause she's a nerd) and I'm happy when I hear Harm's text tone (a generic League of Legends ton, 'cause we're nerds). But how long does that happiness last? A few seconds as I'm replying? And then is disappears while I'm waiting for them to text back. And sometimes they get busy, and can't text back.
I'm happy when I get to sit down after classes and talk to Harm on Skype, and play some games, maybe watch a T.V. show or movie.
But the problem I am having lately is the in between parts. I know that humans don't necessarily need to be happy ALL of the time, but I am one of those people who kind of needs it. All the time.
These little moments every day are not cutting it for me, and I feel like I am trapped inside this little snow globe of a community with nothing to be fillers throughout the day.
Sometimes I have to tell myself over and over that they are going to text back soon, or I can talk to Harm soon or I can sing under my breath, or turn up my music.
My problem isn't the lack of ability to find happiness - it's the lack of time periods where I am truly, honestly happy.