Sometimes when we ask a question, we already know the answer. I think that’s the case with you. You already know you should go to a therapist. If you could have solved your problems on your own, you would have done so long ago. The situation is getting worse, not better.
Although it is certainly disturbing, I don’t think the lying is the central problem. All the lies seem to be a way you are dealing with the distance between the life you have and the life you want. Wanting friends and attention from others is absolutely normal. For some reason, you didn’t develop the skills to belong comfortably in the social world — so you made up a life to compensate. Your problem has been that you don’t know how to get attention for who you really are.
I hope you will use your therapy to help you figure out how to have friends and how to get some positive attention. Because that is the central issue, I do think that group therapy might be the best bet for you, either by itself or as a supplement to individual work.
You made an important first step by writing. Now follow through and take care of yourself by getting into therapy.
I wish you well.