I major thing is acceptance.
The reality is that whatever you're concerned with will be noticed and matter to some. But those "some" are simply not the people you're destined to be with/befriend. There's still a massive pool of people who you can build strong connections with, both platonic and romantic.
Insecurity is the fear, and it's nothing to fear, but just something to accept. A guy who is 5foot 5 will not have the pool of women interested in him as someone who is 6 foot. That is not something to fear, just something to accept. There other things like your confidence, openness which you can do work on which will allow you to make the most from what you've got