Can someone explain to me what exactly is a chaser

I want to preface this, I’m not trans, I’m a cis, bi man but I’ve been worrying that I might be a chaser. This is because the type of people I end up dating or are romantically interested are trans or are men that don’t present themselves as being very masculine. I’ve seen stuff online that people who end up being chasers date or are really into twinks, femboys or otters, and because these are kind of my type in terms of men, I’m a bit worried.