What Causes Green In Colour Discharge And Bad Odour?

right, iav been haveing (what i thought was abnormal 'my mum said otherwise,without checking') discharge since i started my period when i was 13, now iam just 18 and the symptoms are sill there, but it gets worse sometimes, this week iav been sufffering with greenish stuff that dosent exacly smell bad but just odd...i get thick white discharge too and i tryed to douche to try and get it away and just read that i might get PID or what ever and wont beable to have KIDS\!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1 :(!!!!!!!!!!!!!!! iam spost to be on my period, i took my birthcontroll patch off but insead this green stuff wont go away aswell as weird smelling urine iam very much scared and sad.