The only way I have found to feel less worthless is to concentrate on myself and what I want and want to be worth? If you have a goal to be "worth" a million dollars, you would not start by giving your money away? If you want to be a good friend, you have to figure out what you think that is by being one to yourself; other people cannot give you self worth, only you can make that valuation. Your values are yours; the people you like/dislike are not likable, needy, etc. except in your eyes as you are the one doing the action, making the determination of what you think. Do the same for yourself, become who you would like to be.