A lot of misrepresentation is out there about abortions. Lots of it is from prolife/anti-choice sources that want to scare you with false claims. They don't give a rip about you, only that you end up giving birth, and then you are on your own. They will talk about babies. They will talk about how you will go to hell. They will make all sorts of false medical claims such as that you or the tissue mass that is the embryo will suffer a lot of pain, that the embryo is just about as coherent and sane as you are, that you will suffer infertility, raging depression and what not. These claims are all false. If you can, go and ask your doctor instead to get unbiased, accurate information. But pay attention to how the doctor tells it to you. Some doctors do have a political agenda rather than your best interest at heart. If they sound like they are pushing to hard for you to not have an abortion, rather than just helping you to make up your own mind, then you should go elsewhere. You can go to planned parenthood, but remember that they are the ones who also perform abortions, so their view doesn't necessarily follow theirs. Yet, pp is providing unbiased information, as they are prochoice. They believe that you should decide.
An abortion would likely involve you taking two different pills over a few days. You can do that just about now, and over the next 2-3 weeks. The result is some cramping, like a strong period, likely associated with discomfort and nausea for a few days. You would have to get these pills through a prescription, though, so you will need to see a doctor at some point in time.
If you seek an abortion later, you can get a d&c, which essentially is that you get some anesthesia, and the buildup of the lining of the uterus is removed through a suction process which also removes any embryonic tissue attached to the lining (called the "endometrium")
and note that it is a legal medical procedure, and the one who should make the decision is you. If you decide that you don't like to have an abortion, then don't have one. If you decide to have it, don't let anybody bully out into following their ideas. After all, it is your life, not theirs. You are the one who have to live in the future with the result of your decision.
You do have a dilemma. You don't like abortions, but you also feel you are terribly young for being pregnant and you don't think you can handle an adoption.
You need to sort out this dilemma. Seek out information that you feel can help you make that decision, and then go from there.