You get one shot at school, so make the most of it. Messing around now might be fun, but it could also have a detrimental impact on your future. (I appreciate that you can do qualifications later in life, but they’re time-consuming and expensive, and life just gets in the way of them).
Do whatever you need to do to prepare for your future. It doesn’t matter if your friends don’t think it’s cool, or if your family try to put you down for it. You’re not an extension of them. If they want to stay in the proverbial gutter, then let them, but don’t let them drag you down with them.
You do not need to be in a relationship at 12, or at any time in your school career. People will still be there in a few years, and they’ll probably have matured a bit more, and will treat you with more respect as a result.
Only stay in relationships with people who do not dictate how you dress, how you have your hair, and who you speak to. Never let anyone diminish you to their version of perfect. Always be yourself! Actually, this is one that I tell younger people if I notice that their appearance has drastically changed, and it’s a result of their boyfriend/girlfriend not liking how they look
“You don’t own me”, by Lesley Gore, SayGrace and whoever else has covered it, and Jess Glynne’s “Thursday” might just be songs, but the meaning behind them both is important.
Always have access to your own money. Tying up your finances with someone else’s is a messy business, especially when you depart from the relationship.
Humans have great instincts. Use them. If your gut is telling you that something is wrong, trust it!
You have the right to say no, and to express your thoughts and feelings. Your opinions are just as valid as everybody else’s.
Learn to stand on your own two feet, because independence is important. Learn to drive (or to navigate your way around with public transport, if you’re in an area with good links). Learn how bank accounts work. Learn basic skills, like cooking, cleaning, basic DIY and sewing, so that you don’t have to rely on others to do this for you.
Take every opportunity to learn the things that interest you.
You can go out to events by yourself. You don’t need to restrict yourself because you don’t have someone to come with you to the pictures or the pool.
Your hobbies and career should not be defined by what is (or isn’t) down your trousers. There are female farmers, electricians and astronauts. There are male midwives, nannies and primary school teachers.
Be bold and brave and true to yourself!