Hi Verks,
I am sorry to hear that you feel this way. I found out that this is a somewhat vicious circle. When you are sad, others will notice, and people just don't like talking to sad individuals that much. The opposite of course also applies. If you can make yourself to smile all the time and at everything, others will notice. And as a result, they will start talking to you, because people like talking to happy persons.
But the most important thing is what is said already, that you love yourself. If you can love yourself, feel good about
everything you are, if you can fully accept who you are. This can be a major step in your life, because once you truly love yourself, your happiness won't be dependent on others or other things. No outside change can take away your happiness. So in fact, what I am suggesting here is the "key to eternal happiness". It won't come in 3 seconds, but if you had enough of the pain and sadness and are willing to do your very best, you will succeed. Practise makes perfect.
But for now I suggest you keep on writing down your thoughts, and sharing them if you want that. Or just make time to do the things you like (although I know how hard it can be to motivate yourself if you feel sad).
I wish you all the best, and please remember that you have just made a friend!
Erik
All the best