Foremost thing nobody could ever be happy alone in his/her whole life but if you want to be happy for sometime so in my opinion you should try to enjoy the things you do for e.g. if I am reading books or making art piece of mine I give it my whole soul and brain to make it out and I really enjoy the process and at that time nobody never disturb me even my parents so I am totally alone at that time and I am happy.
Further , try to come with old friends even if they are far away from you just try make contact with them just share some little things about what's going on your life or just discuss...