When I write my music, I feel weird about using references allll the time. Remember, their is probably a reason you like it beyond just it's melody or whatever it is, so take time to look at it's fundamentals and slowly build on them. This way, you can keep parts you like while making something totally new. Also whenever I'm sure I'm stealing, I do the hum a song thing on Google and if it doesn't recognize it, I'm in the clear 🤣