I think any man worth his salt won't let that get in the way of finding you attractive.
It clearly depends on how big they actually are.
Anything out of the norm or dis-proportional to the rest of your figure can be construed as 'unattractive', it depends on the bloke, not particularly liking them doesn't make him an awful guy.
I would not advise changing yourself one bit. You are a diamond in the rough/treasure. More men would love your your nipples just the way they are than not. Let that guy move on if he doesnt like em. There are ten that would take his place.
Hi are you referring to the actual nipple or the bit surrounding it the areola. Also did you lose your virginity to that guy I presume you have slept with other guys and they haven't been put off by it. I dunno if I would be put off depends how big they looked.
Puffy nipples are weird to me but it wouldn't put me off a girl. I still have ****ing man boob type nipples on my pecs from when I was a big old fatty (all toned and healthy now) which annoy the **** out of me.
Never had a woman complain or point them out tho.
Stop being so insecure. Your insecurity only goes away if you build yourself up mentally to simply not give a **** what others think. If you get plastic surgery or whatever you'll just find other insecurities about yourself.
Would love to hear what became of you and your nipples OP.