Nobody can actually TELL you if you should get an abortion or not. I just want to warn you that a lot of pro-lifers are going to read this and tell you not to abort.
To me, you need to sit down, think of the pros and cons of having this baby and the pros and cons of not having this baby.
Obviously this "man" needs to be out of the picture. He can't tell you to abort your child, that is your decision and yours alone.
Are you living at home or with him? Do you have any way to support your child/children? CNA classes run about 10 weeks, right? That would give you plenty of time to finish classes while you are pregnant so you are able to go back to a decent job after delivery (IF you choose to keep the baby).
There are also TONS of couples out there who would love to have a child and are unable to do so. Adoption is also something you might want to consider.
Let me know if I can help you in any way. I know how hard things must be right now but there will always be light at the end of the tunnel. Just make sure it's not a train.