What should I do!?? Please help me!!?

My boyfriend and I have been together for quite a long time now and two weeks ago I found out that I am pregnant. We did use protection, but I don't know what happened. I don't really want to keep this baby because if I do, my whole life will change and I won't be able to have a good career etc. (I am 17 right now). Money is not an issue though, we both come from a 'wealthy' family. The problem is that my boyfriend does really want to keep this baby! He is trying to convince me that we should keep it all the time... I find this decision really hard and I don't know what to do!!! I get so sad when I see my boyfriend play with my little cousins, he loves kids so much. If I do decide to keep this baby, he won't even be there when he/she is born... He is leaving to the Iraqi army in 3 months... Please help me I really don't know what to do!!! :(