Why don't you go back and count how many times you wrote the word "I" and "Me" in your post. Sometimes the best way to get over feeling lonely is to take the focus off you and place it someplace else. Giving of yourself is the best medicine.
You sound a little depressed, but you didn't list your age, so it's hard to give advice not knowing if you are 14, 18 or 20. Do you exercise? That's a great way to feel good.
Your parents should not have to "check" on you before they leave for work. What have you done for them lately?
I say grow up. It's a tough world out there and you just need to get a little tougher.