Try to get more variety in your observation hours, do things outside of PT to balance out your application. Look into programs that help the community like Big Brother/Sister, Special Olympics, ect. Build good relationships with your professors and PT's you're shadowing. Show them your drive and dedication with your work ethic and interest. You have a lot of time to do all this so take it day by day, don't waste any time. Also look into schools you're interested in, talk to the admissions offices of the schools, let them know your name and show them that you really want to make it to their schools. Again, don't waste time, try to involve yourself with projects, clubs, events, ect as often as possible and make yourself as well rounded as possible. And as important as stats are, you can balance the scale with being a leader in your community. And most importantly, as cliche as this sounds, believe in yourself and your abilities. If this is truely what you want to do you'll make it possible however long or difficult it might be. Think it over, work your butt off and you'll be fine. Best of luck!
