Transparent pimples penis shaft what is it? Is it a STD?

Ive been dating the same girl for more than two years and she visited me for five days, we had unprotected sex as always and we tried anal, some days later these came out. but im also in a new place where its really hot intemperature and ive gone through a ton of stress. Should i worry about these things that came out, i cant get it off my mind. if i pop these transparent liquid comes out and it doesnt even hurt, they pop so easily, idk what to do, help. i cant afford a doctor right now