Clumps in my discharge???

Ive been having weird discharge for some time now. When i was last sexually active (about 6 months ago), my partner would comment how thick and abnormal my discharge was on his fingers and would leave his penis dry. So i got tested for yeast and STIs but came back negative Now i would like to be sexually active with a new partner but im so self conscious about it. I got STI and yeast infection tested again and still came back negative. ive even gotten a pap test and the gyno said it doesnt look like theres a yeast infection. i took probaclac 14 day capsules (doc said to try it out) and its been a couple of days since finishing and still nothing has changed. The best way i could describe the discharge is having little clumps and pasty. When i am pleasuring myself, little bits gets around my vagina. I dont use scented soap, wear cotton underwear, dont douche, and eat relatively healthy. i take a really low dose of antidepressants but not sure if that does anything. is there some other internal issue going on?? should i try taking a yeast infection medication like monistat?? please help!