There are visible veins on my fully erected penis, and sometimes sperm drops come as well., i use to masturbate ...should i worry? am 23

Sounds normal: All grown men have visible veins there, especially when you are erect. When you get excited, you will sometimes produce both lubricant (clear fluid) and probably some semen if you haven't had an ejaculation recently. I'm concerned that you "used to" bring yourself to orgasm and that you're trying not to do so, perhaps from misguided fear. Talk with your physician or a sensible grown man, maybe Dad