Actually, it's the opposite. The older you get, the less height matters. Not only for you, but for those around you.
I think if you just try to forget this topic a bit and just focus on improving yourself as a person, your life will get better. Or maybe you don't need to forget the topic, but be realistic about it and don't be so harsh on yourself. Everyone has their limits in life. Life is not fair. Some people are just born richer, better looking (eventually), more intelligent and have better, more caring parents than the rest of the population. Likewise, there's nothing that stops someone from being born to shxtty parents, looking terrible, having all sorts of chronic or otherwise terrible health conditions as well as a low IQ, and still having a terrible time at school, etc. At least LL is a thing in our current age. There's absolutely nothing people with low IQs can do to make their IQ significantly higher. There's nothing people who were born blind can do to make themselves see (as of yet). There's nothing people who were born with chronic, inherited genetic diseases can do to cure themselves. Put things into perspective. Try to see the positives you have going for you and other people will too. I'm sure you have them. Don't dwell on your shortcomings. Everyone has some. Some less than others.