Ainsley, your so called friends are being mean and immature.
I hope MNHQ remove your pics to protect your privacy on such a very public forum! not just for today, but if you wish to continue posting with relative anonymity as your pregnancy progresses.
It is up to you what you do with your baby, but you absolutely don't have to decide right now and you may find your mind changes back and forth a few times as you debate your options.
Can I ask why you think adoption is the best option? As a mum of a daughter of a similar age, I wonder if it is because you would rather you didn't have to see the baby each day, and would rather it could be forgotten about?
I would imagine you would never stop thinking of this baby whatever you choose to do, so adoption won't make it go away in that sense.
I would also speak to your parents about why they are so keen to keep the baby. Communication between all of you will help you reach the decision that is best for you.
Finally, you are not a slapper or a slut, you had sex. Some of your friends may be having sex too, but have not had a contraceptive failure/mistake, but they will feel embarrassed about publicly supporting you.
One of my DD's circle of friends had a baby at the same age as you, the baby has just turned 1. The girl is still at school, still has ambition, is not with the baby's dad but they are both in the baby's life. Her parents, the grandparents, were supportive like you. This girl, zi am sure, had some namecalling, but she is now one of the most respected girls at school, respected for how she coped with a tough situation and for being a bright, confident young mum.
Good luck up to you.