Teenage Jesus freaks (and Jesus freak wannabes): join/start a discussion here; give/seek advice and encouragement.
Let He Who lives without sin cast the first stone.
Sit down and read the book of Romans, not just a verse here or there but the whole book. Romans asks "Is he the God of the Jews only, and not also of the Gentiles." Romans 10, speaking of salvation of Jews and Gentiles says, "for there is no difference..."
As far as the black Hebrew thing goes, why would Blacks all be the true Israelites. The closest genetic relatives to Israelites are Edomites and Ishmaelites, and Palestinians and Arabs are Medditeranian aren't lilly white, but they aren't black either. Not most of them. There is a range of skin tones.
Jews who intermarried enough with Europeans look European. If they intermarried enough with Ethiopians, they look Ethiopian.