That seems to answer the birth certificate situation very well: Try to get on with your childs real father, that`s both of you: What`s the `talking` issue - I was assuming it was pobably only a respective ages thing. In which case, you have a child, so that would make you affectivly older in any case!? - You may be more mature than him. It doesn`t make any difference either way now, just provided that you are both mature enough to make it work. What you must have is stable support, and especially from your parents. Do you think there`s some reason why he might be considered bad for you? If so, then try addressing this, that`s my advice. You obviously want him on the birth certificate, but nothing is ever perfect, and you`ll be doing the next best thing anyway.
You need to be aware that this could be just one other in a whole string of what would otherwise, child apart, been short lived relationships. You cannot generally know someone well enough to be quite certain, I don`t think, much inside a year. Your circumstances might speed that up. Stay always positive.