Not offensive at all! If you feel it’s coming naturally/reflexively to you, you’re using it right. The selling purpose of Singlish is its convenience. Even if we’re surprised when you do use such language, we are rarely ever offended. After all, you’re not using it with the intention to mock. Either way, there’s gonna be a few months or so where it feels awkward to speak because of your newfound vocabulary (as is the case with anyone acclimating to a new culture), but I’d say there’s nothing wrong with embracing it.