Relationship Advice - How to Bring Up Those Feelings Early in a Relationship

In any relationship, you start to wear a groove pretty early about what we do and don't talk about. In relationships that i started after that, i was more apt to bring up feelings very early in a relationship. But even realizing that, i still have a hard time with people i've known for like 20 years,. And you did this thing when we were 18, it really bothered me, rightly? Am i the only one that holds on to this? A, you're the only no, of course not.