Can anyone help me please?

I feel like I have an infection but I’m not sure if it is something small or something worse. I’m experiencing pain/discomfort in my vagina, I’m having a lot of discharge, it doesn’t seem to smell but sometimes has an off colour to it, mostly white but I feel like once it looked greenish? It doesn’t burn to pee, I’m not itchy or red, but I noticed sex was a bit uncomfortable at times. Does this sound like a mild infection or something as serious as an STI? Please help me.