I guess the key is to find a way to let them know, without just saying "I HAVE ACNE" It's very hard to bring it up on a profile without making it sound like its a big problem, but I guess you could just say "I have some acne that's visible without makeup so I dont want to mislead anyone with my pictures". Which is the truth really.
and as for the bottom paragraph about you thinking you shouldnt be dating, Im only a teenage boy so i'm no phsychiatrist but I'm guessing it has alot more to do with your confidence in general and less to do with your acne.
It's hard to deal with confidence issues, I had them myself before and its hard to say what fixed them. Improving your confidence will help you learn to notice your acne as much as everyone else would notice it. looking at your picture I wouldnt know you had acne.
If it makes you feel better I know a girl with worse acne who is extremely confident, and she completely loves herself (maybe too much).