I really don't know what I want to do when I'm older, and I do really enjoy biology, I'm averaging a grade 6/7 at the moment which is already enough for me to do it at a level
Is it hard? My sister did it but dropped it after a year?
If you enjoy it and find it reasonably okay at GCSE you should be fine. Keep on top of the notes and the work though, Biology isn't so much about hard concepts, but there's a lot of content to remember. Work through the year and you'll be fine.
I did it at A level and found most of the concepts easy to understand and apply. There is a lot of content though and you need to make sure you remember it and go over it all if you want to do well which is something I didn't do