@Hotpinkbug,
So, are you prepared to take care of a baby just as you turn 16. You are putting yourself and the 23 year old idiot in jeopardy. I don't care what he tells you, you your mother doesn't care, you at the age of 15-16 will have to insure your own well being and the surprise children that may be produced.
How old was your mother when she had you? Do you have a father at home? This will not end well, trust me, I've seen way too much of this in my life time. I'm not saying you are not interesting or bright, but think about this. Why is a 23 year old man trying to connect with a 15 year old? I can think of 2 reasons right off the bat. Either he is so immature, women in his age group reject him, or he is an opportunist who thinks 15 year old girls will buy into his well practiced line of seduction.
Be smart, if something seems too wonderful for words, it's probably not. Don't become a victim.