Feeling low. Know how to come out of it.

From more than a year I have been struggling to get over my depression, for which I feel have overcome to an extent. But I feel I'm putting on a fake smile and faking enthusiasm everytime. I feel exhausted for no reason and I don't feel like doing my work (I am a freelance interior designer) nor do I feel like talking to anybody. I feel like staying in my bed the whole day. It's not that I don't have a social life, but I feel it's all temporary and once I'm back home I'm again exhausted for having done absolutely nothing. My family knew about my depression and now they think I'm over it, and I try to portray to them that everything is fine with me. But I do not know how to deal with it anymore. I am a very optimistic person otherwise, but now I have started to feel very insecure about my future, like I might not have any future at all and my life is going to stay constant forever. I'm frustrated and irritated because I feel like this. I don not know how to come out of it.