How do I get over the shame I feel for being a lesbian ?

You can't change who you are sweetheart. And you should not have to hide it. You live your life the way you want to. Not having a support system can be tough, but living your life the way you are meant to means so much more. There are judgemental people out there who will try to bring you down. But those people will ALWAYS find something to fight against. Be you. Believe in yourself.