Life is what we make of it, so it is really YOU yourself who give your life a purpose. If you feel you need friends, go out and make friends. If this is difficult for you, look up for ways to make friends. There are many sites that give good tips. If you think you need to pep up your life, go out, get a hobby, try something new, be brave and explore. You will not change your life if you don't try.Ultimately, it is down to you to make the effort to do something about it. Sometimes the best way to feel cared for is to go out there and share your love with people (that's why people who volunteer at old folks' homes, shelters or orphanages find joy in what they do - the more love they give, the more loved they feel).
But having a busy social life and having thousands of friends will not make you happier or less pathetic. Try to rethink your values on what is 'pathetic'. Whose values and perspectives are you basing your assumptions on? Who's to say your life is pathetic? Some people have very few friends and don't go out much and can still enjoy their lives because they acknowledge that they don't need to be part of the crowd to be happy or have fulfilling lives.
Also, if you still have family who give you food and shelter and don't abuse you, it's unfair to say nobody cares.