There's no magic bullet that will get you through "any door" - every person is different, and every person has different things they want in a partner. There are some people who will absolutely refuse to date somebody who isn't taller than them, and if you're too short, then yeah - nothing you can do will change that.

But there's nothing you can do to change that, so why get hung up on it? There are plenty of other people (I'll drop the dehumanizing metaphor of doors here because it's not needed) who have different criteria that you could meet, and focusing on the things about yourself that make you happier (like being emotionally available, being able to communicate, and having a clear sense of your values) seems like a pretty reasonable way to go about meeting those criteria with a side-benefit of making you happy.