You think you are alone, but you are not. Chances are you have a job and commute back and forth to work. You also must go shopping for food and clothes, a few times each week or month. You either live in an apartment or house or with your family. You may drive a car or commute. If any of these things apply, you have an abundant amount of people around you. You just haven't seen them yet.

If you work, there are co-workers, bosses that you must communicate with. telephone calls that you speak with people with, or place orders with. Even if you place a call to customer service to discuss your phone bill, credit card bill, whatever, you are still speaking with and communicating with a human being. have you ever just stopped and asked those people a simple question "How are you today?" You'd be surprised at the spontaneous conversations that would arise. You've connected with someone.
If you commute, there are people on the bus or train. Chances are you see one same person almost every day. Stop and just say 'hi'. Talk about the weather or the late train. Something.

If you go food shopping, you can say hello to the check out person. If you shop at the same place, same time, every week, you probably see the same check out people, deli clerks...ask them how their day is going? or discuss the food products-is it fresh? what's good this week? Conversations start up very fast. they will get to know you, recognize you the next time you come in, they will take an interest in you and you will not feel so all alone. Ask a waitress how her day is going? The coffee person, on and on and on.
Unless you are living in a glass bubble, you don't realize how many people you come in contact with during the day. The library, the dry cleaners, the car mechanic, the mail person, the delivery person, the bank teller, even an elderly person trying to cross the street-help them. Say hello. They are just as lonely as you.
If you live alone I am sure that you have neighbors. Go for a walk and look for other neighbors who are either walking their dogs or bringing in groceries. Say hello, ask if they need help or just nod your head in recognition. it may take a while but people will respond and ask how you are. Bake a cake for someone who is ill, or make some soup......anything, and just give it to someone who may need a hand. Call up your local charity, school or church...ask if they need anything or if there is any function you can attend. Look in your local paper for clubs that get together like, book clubs, garden clubs, scrabble clubs, hiking, knitting, something. Go alone and check it out. Sit in the back if you must, but just go.
You think you are alone but you are not. There are countless people out there who notice you but are just waiting for your nod. Go say 'hello' and watch what happens, OK?