Feels like there's a lot if mucus in my throat, I don't smoke nor drink or have a cold. Where is this comming from?

See answer. Excluding problems such as postnasal drip, chronic sinusitis, allergies, or other ent-related causes, a commonly overlooked cause is gastroesophageal reflux (gerd). If a persistent, bothersome problem i would recommend you see an ENT specialist for evaluation.