Well, I've found two versions of this sentence, and only one is right. "I'd picked her out over any girl I'm with." You're right in that I'd = I had, but this actually doesn't make much sense. It should have been... "I'd pick her out over any girl I'm with." Here, I'd = I would (if you're wondering, we look at the verb which follows I'd). In the context, I agree with John: pick her out means to choose her as a girlfriend. If he could turn back time...

"I'd" is a contraction of "I had", but it is also and more commonly used as a contraction of "I would." I think you are thinking of the verb: Choose - to select or pick something. You could say, "I'd choose her over any other girl." or in past tense, "I chose her over all the other girls."

I agree with John I'd can be I had or I would. But 'picked out' could mean choose...but it can also mean recognize (if she is already familiar) or your attention gravitated toward her (like she was the only thing you could "see" in a crowded room)

Actually, your sentence is wrong. 1. I'd pick her out over any girl I'm with. (would) 2. I'd have picked her out over any girl I was with. (had) These are correct.