I only play Colle system kind of openings (Classical colleColle, Colle-Zukertort, Stonewall etc.,) I somehow am very comfortable with the structures it creates on the board. They are not aggressive at all, compared to the other stuff, which is why I have adopted it. On the contrary, the primary advice given to an improving chess player is NOT to stick to a particular class of opening, as though it "belongs" to you and you have some emotional attachment towards this.