You did very well in your BTEC, congratulations. You have to get your english and maths gcse's but once they are done I don't see anything stopping you doing an IT related course.
You do need to take into account that degree level work has a huge focus on english skills in essay writing, so it would be wise to get to a point where you are able to write very well. However, there is also help that you can get from the university in the form of tutoring which may can help with writing skills.
If there is anything I have learned from my past in education (I didn't have an easy time with it), is to believe in yourself and do what you want to do (and not anyone else), and you will most likely do well!