So first I thought this was going to end as an internet meme (like "haha roflcopter got you" or something like that) In all seriousness, you have an amazing story and considering how you started, you're a very lucky man. As you said it's going to be very hard, if not impossible to find your family, but if you do, what difference will it make? You have someone to be upset with, or you find out they're dead. I imagine the immigration and naturalization department can help you on your way, El Savador may have a similar department but if they do it's probably not very well documented, especially through different administrations and the civil wars. Be happy with your life, and everything your adopted family has given you (not saying you aren't) but just know what you gain compared to what your expectations are. But just my $.02