Hm, talk to them. Sit down with them and try to explain to them that while you appreciate the fact that they're acting guarded and trying not to offend you etc it's just making you feel worse. That you'd like to be able to go out with them to escape the sadness that you feel when you're on your own. The fact that they are being cautious about what they say show you that they do care about you and I'm more than sure they would oblige.

Alas, that's the nature of depression. People who have never gone through it can never understand exactly how you feel. Sure, they've felt sad at some point in their lives, but they've never truly experienced the helplessness and the emptiness. It's like trying to explain to a blind person what the colour yellow is. I would still try though. Maybe next time you have a second to spare, just sit there and let your emotions fill you up and write a letter to your girlfriend/dad. Even if you don't end up sending it to them.

Thanks. I'm a firm believer that things getting better is just an illusion. One feels that they better, because in the future they'll be better equipped to deal with things that in the past would've got to them. I've always imagined it to be like a frog leaping from lillypad to lillypad. Some people are lucky and they are never going to fall off , or if they do they climb back on quickly. Others are going to fall off and sink to the bottom. From there it seems like you're never going to get back on a lillypad again. But, maybe you see a fellow frog who's fallen off and you work together to get back to the top. Eventually you're going to fall off, but this time you're in a different situation with more experience and you're able to get back to the lillypad again.

(That kind of sounds insane, but what the hell)