Having parents who don't fit into our view of 'normal' can be a big focus in our lives. Whether it's their eccentricity, their refusal to grow old gracefully, or their sexuality, it can feel like your parents' actions are making problems for you.
People don't suddenly become gay, it's a gradual journey and often a difficult one for them to finally admit their own sexuality to themselves. Your parents have probably struggled for a long time to come to terms with their sexuality and they will undoubtedly not like the fact that it is affecting you, but they have to be able to fulfill their own lives too. It may be hard to fathom who they are and why they have made their choices, but you need to respect that they are individuals as well as parents.
There is a vast amount of information on the Internet on this subject. It can give you a better insight into not only how your parents may be feeling but also your own feelings too.
If you still feel that your emotions and feelings are too big to handle, talk to your GP, who can refer you to someone with experience in helping with this kind of issue.