You can support him, but if you are 16, I'm not sure if you are legally allowed to get married at that age anyway. It varies from state to state......so I looked it up for you:
Michigan: Applicants 16 years of age may marry with parental or legal guardian written consent. Applicants under the age of 15 with parental consent and probate court permission. 'Marriage of a Minor': The legal marriage of a minor “shall release such minor from parental control.”
http://www.coolnurse.com/marriage_laws.htm
It's really reasonable for you to be upset....because you love the guy and he sounds awesome to want to do all this for you. No matter what the laws and if it would be worked out, you should never get into something that you are not ready for, even if it means submitting to the cliche "absence makes the heart grow fonder."
Just consider the repercussions a trip overseas would have for you and your little one. I think that for the sake of health and stability, it would be better if you stayed home for now, even if you did decide to marry. You need people around you, like your friends and your parents to help you out with your new life with a baby, because being a new mom isn't going to be easy.