Could I have an STI/STD?

Please read.

I was tested last December when I got my IUD put in and I was clean, I’ve only been with two new people since then, both one night stands. The first was months ago and he said he was clean and I didn’t have any problems/concerns after the fact.

The last one told me he was clean, he had just been tested that week when he enlisted in the Navy. This was approximately one month ago. The past week and a half I’ve had a itching/slight burning sensation on the inner labia part right next to my clitoris. It’s red and just slightly swollen. I’ve had extremely unusual discharge since having sex with the last guy, and I still haven’t had my period. My libido has went from overdrive to absolutely non existent. And the one time I was in the mood, I couldn’t get wet because playing with myself was too much discomfort/pain.

Is this worth getting tested over? Or could it just be a yeast infection? I’m 17 and don’t really have anyone who could take me to get tested. Thank you!