I'm 5'5, pretty average (ie. not rich or particularly physically attractive), and I've consistently had attractive romantic partners my entire life. US-based, metropolitan area if that matters.

I don't really have any advice, but I really don't think your height is limiting you. Don't get me wrong, it's definitely harder than if you were six inches taller, but it's not that bad.

It's one factor of many that affects your overall attractiveness and many people don't care about it at all.