Hi everyone 
Could I please ask for your advice on how I could be more assertive and have more 'presence' please? I'd really appreciate any tips you might have, as it's always really useful to find out other opinions 
The backstory behind this is that on Wednesday, I had an interview for a School Direct teacher training placement. (Just for anyone who doesn't know about School Direct, it's a scheme where trainee teachers study for a PGCE at the same time as working full-time in a school from the first day of their training year.)
The interview day that I had consisted of a panel interview and a lesson that I had to plan and teach after being given a specific topic beforehand.
The feedback from the day was that my interview was strong. However, I had to teach a lesson (English lesson) to a Year 8 class as part of the day, and this lesson was observed by a senior teacher
I had a feedback session with this teacher after the lesson that I taught, where I was asked to comment on how I felt the lesson went before she gave me her own feedback.
One of the comments that the teacher made was that he felt that I lacked 'presence' in the lesson in terms of my interaction and behaviour with the pupils. I'm not disputing this, as I felt that his comment (and the other feedback that he gave me) was fair and well justified.
I have also been told by other people in the past (family and friends) that I don't always come across as assertive and confident, which I understand is an important quality in teaching.
I'm petite (which may seem irrelevant, but I don't think it helps in terms of my 'presence', although I realise that there is notan awful lot I can do about it!
) i am normally quietly-spoken, and do often apologise more than I should (think clichéd British apologetic behaviour, but perhaps more pronounced!
)
I have tried to tone down the (often unnecessary!!) apologising, which I feel has helped.
However, I would appreciate more tips and ideas on how I could go about improving my confidence and assertiveness please! 
If you have any experience of this in a teaching context as well, your comments would be particularly welcome!!
Thank you all so much! 