First let me say that it saddens me that you are going through this and I am thankful that you have family who are supportive in any decision that you will make.
I understand where you are coming from because I too once walked in your shoes; however, I much younger at the time. If it had not been for the LORD on my side or the ordeal that I've gone through I don't know where I would be today. When I say I understand where you are coming from I do. I had an abortion two months before my 16th birthday(without support family support) and it was the right decision for me to make considering my circumstances. I constantly regret "killing" my baby but then on the other hand I'm thankful because I know I wasn't and in many ways am not ready for the responsibilities that come along with being a parent.
I, nor no one, can not tell you what to do. You have to follow your heart. You already know that parenting is a huge responsibility (financially, physically, emotinally, and mentally). Are you prepared to make sacrifices for someone that didn't ask to be here?
Because you have a supportive family and if you put your faith in GOD, you can make it.
If you need to talk more confidently or whatever, don't hesitate to email me.
A friend from afar