Your teammates will respect lucky 15 football fancies you and the coaches will take notice.
Work your butt off on the field, in the weight room, in the film room...work hard, recover hard, eat well. Never stop.
And, be prepared to simply keep working hard no matter what. There will be set backs but you've got to keep pushing. You have to outlast. Sometimes you have to wait for an injury...or a chance to make a big special teams play...whatever it is, be patient, and, when your time comes, hold nothing back. Do this and your coaches will notice and you'll find yourself as a starter.