Like I always say, "ADOPTION!" I think it's rather silly to only present abortion or parenting to yourself.
No one can deny the fears of pregnancy with a partner or not. Hell even with a support system or not. Believe me in the end it doesn't matter as soon as that little baby flips, kicks and hell beats their heart enough you can see it looking at your stomach it's all worth it and it's a lot easier with the reminder that they are unaware of your situation and just wanna live. Whether you choose parenting or adoption you can get through the pregnancy a lot easier by thinking about what your giving them. Adoption, IMAGINE! That little baby could be in a home with two loving parents, siblings, good steady income, toys, a nice neighborhood and if you choose, you, in that same picture. Parenting though has a lot more downsides but it still has some upsides. You get to cuddle them each night (and that takes away the hardship when you see their smile), you get to raise them with your personal values, you are their world, ect.
Abortion to has some pros. Although I personally do not believe in it I do see the pros it has. The pregnancy is terminated. No worry. That simply.
Also think of your negatives.
But from what you have described to the forum I can honestly say I promote the choice of Adoption to you. Scary, hard ect. IT'S ALL HARD. Abortion is not easy. THERE IS GUILT. So I am saying this, if you think it's the easy way, it really isn't. Because you will miss that baby, think about it every day and then will have to deal with your feels. Luckily there are a lot of post abortion support groups. It's not a form of birth control, it is a serious parenting choice.
I am not saying do not do it, I'm just saying it's not the 'easy' choice. Parenting is not the easy choice either as many girls think it is. Also adoption much like abortion has a guilt/selfish factor to it for many woman.

no young mother has a set up, perfect support system. If we did this would not be a 'problem' in our society would it? I wouldn't worry much about it because the support comes no matter what one of the 3 options you choose. Someone will sympathize with you and help you through it.
BTW: No man is worth having if he won't let you even consider parenting. He obviously doesn't love you much if he's not even willing to consider spending his life raising a beautiful child with you, in a relationship or not.