You shouldn’t worry about things like getting into seminary simply because you have no control over it. Therefore, it won’t help whether you worry about it or not.
This is really your Yetzer Harah trying to distract you from the things you should be worrying about: the things which you DO have control over- like bad middos you can fix or aveiros that you can overcome… Rather loose sleep over things like that! (even though its secretly really fun to think and worry about sem! but don’t let it get the best of you!)
I’m not saying that sem isn’t important- it is!- i know, im in the same boat! but its just pointless to worry about, because at this point there’s not much you can do (besides daven!) to change the situation.