Wolf, I also know what you are talking.
What Lizzy says it's true. Fight for loving yourself and enjoy yourself is the first step to have healthy relations with people.
We are all more or less alone. But, do you think we all feel alone. No, we aren't. Bc many people have themselves and feel that they have themselves so they are strong to face to whatever.

People, friends, can't fill this emptiness. You can't trust them in that bc they have their own things to solve and bc they aren't you.

I know what a marvellous person is you but you have to keep some of this kindness for you. You won't be selfish for worrying more about you and less for others. It's something you have to do. Don't you see it? The stronger and the better you feel with yourself, the better you will be able to relate to others.
You won't feel this insecurity towards others and you even are going to be able to give them the best of you.

Sorry, I sometimes behave like a mother. You can do it, Wolf! You are not alone. You have many people here who care for you.

I know you are feeling depressive and can't see what I'm saying.
What about trying to write down some possitive things about you. Do you like writing on a journal? Forget the negative points. Only the possitive ones. And talk to me.

Hugs!