I'm only 21 but I'm way more mature than most my age due to my upbringing. So of course it's most girls dreams to have kids. Well since this past December I miscarried 4 times!! 3 in the last 3 months. Is that normal to have high miscarriages like that? Will I ever have my own child?

I doubt you concieved in 3 months 3 times.
P.S- I am a doctor doing internship.
Unfortunately, it can happen for many reasons. Go to your gyno and they will be able to tell you what your options are from here.
So, yes, it is possible. But these days, reproductive science has moved on immensely and it would definitely be worth consulting an expert to see how you can improve your prospects.
I am sorry for the pain. I've had my fair share of miscarriages and the reality is, most women have them. And many more have them without knowing they had one. You are young and have plenty of time to figure out what your body is doing.
I think you have to remember you are still young. You still have bags of time. I personally know a woman who miscarried for no reason 8 times until she had her first healthy pregnancy. You hear about women like this all the time. Counselling sessions helped me a lot to come to terms with my miscarriages.