when looking at the crowd, don't "use/focus on your eyes," just focus on what you're saying or about to say, that way you won't recognize how people react to your speech. like coca said, just act casual. pretend you're talking to a wall.
be passionate about your speech. learn all you can about the topic (at least if you're interested in it), so if you forget something, just improvise something related.
you can't really have tips about stage fright, though. it all just comes down to how often you do it (practice) and how good you do it. used to have it too, but ever since i was a kid i've been continuously selected for doing speech-related activities and stuff.