Hey thanks for your letter
It sounds as though you are going through a stage in life that everyone experiences. As you grow up, not only does your body change and develop, but also feelings, emotions and sexuality change and develop. We may feel attracted and excited about the same sex but that's ok.
All this takes time and it can all become confusing, but be patient and don't rush things. Your head will work it all out for you. There are lots of websites that can give you information about growing up experiences have a look at www.fpa.org.uk or www.teenagehealthfreak.org
I hope this helps
Take care
Sam