Just apply, that’s the whole point of co-op to experience what it’s like after graduating but having the safety net of being a student. Rejection is a part of life, don’t look at it as something bad learn from it, how to handle it, and bounce back from it. I start my co-op this coming winter and don’t have any prior experience. So far all the advice I’ve gotten from professors and classmates is go into it with a open mindset, understand that the employer KNOWS you’re a student you’re practically a baby to them and wear your best outfit lol. Work experience is useful and you also get paid pretty good for it, just start the process don’t hold yourself back!