Responsible babysitter in Aylesbury

My name is Lauren and I am 17 years old, soon to be 18 and I am a child of 4 with 3 younger sisters, who I often look after. All of my cousins are younger than me and during family events I am left responsible to monitor and take care of them, making me very used to looking after younger children. I have conducted work experience at a primary school, where I mainly worked in Reception and have volunteered to come back and gain more valuable experience. I am looking for regular babysitting or adhoc, and I am available during the weekends, half terms, and during the week depending on my college timetable.