It is up to you what you want and what is comfortable for you. With my first child it was just me and my mother, so I wasn't alone. With my second kid, it was me, my husband, his mother and my mother. I enjoyed the experience. With my third kid, believe it or not, it was me, my husband, my brother and his wife. Although it sounds odd, my brother has never had any children and to be able to have him be a part of that was pretty amazing. With thus baby, I might even have my step daughter (21) and my oldest daughter (17) in the room along with whoever else would like to be there. To me the more support the better and being able to share that with people makes it even more special. But it is what makes you comfortable. I didn't think I would wabt all those people in the room cause of all my stuff hanging out and showing, but when the time comes that is the last thing on my mind, and theirs, you are all too busy waiting for the baby to come out!
i'm a big advocate of doing what you want to do. i don't think anyone can tell you how you're feeling. that being said, maybe you want to ask your bff or someone you're close with to be there at the hospital (or wherever you're planning to give birth) just in case you change your mind. that way the person you ask knows that you want to be alone to do your thing but they know that you might change your mind too.