Hi, Lemon & Lime! It's all part of the process of grieving, I'm afraid. You'll get through it. How about going to classes or hobby groups? You'll find somebody with the same interests. Reading books about people skills is good too.
People tend to sense if you have a 'great big secret' and could possibly shy away from that. So if anybody asks what are you doing for Christmas just say I'm going to see the folks or something, you don't have to tell the whole story from the get-go.
Once you are comfortable with people then you'll be able to say, oh, yes I'm having christmas with friends this year, and if they ask why, then you start telling them.
There's some fanstastic people out there, so let them in!
Beachwalker