Can you get trichomoniasis with a condom on by skin to skin contact? can it cause yeast infections type symptoms? last send was with a condom 11 months ago?

Infection with trichomonas generally requires vaginal intercourse (penis in vagina). Condoms probably come close to 100% protection. The main symptoms are vaginal discharge, usually colored and usually with strong odor. Itching might occur, but typical yeast symptoms (irritation, redness, scant thick discharge) are not likely. Most trich at your age is new diagnosis of longstanding infection.