is my son too young to train still ?

My son is exactly 2.5. We've been trying to potty train him but as soon as he sees the potty, his undies or his pull ups he cries hysterically. I tried undies and telling him that peeling is on the potty but then he just pees in his underwear and doesn't even seem to notice 🤔. When he goes on the potty he's too distracted to sit there even with a book or toy. I've tried candies and rewards but nope he will just sit there screaming that he wants them without working for it which gets us nowhere. What am I doing wrong? Any tips? If it matters he's a very normal child but he was late for most milestones - didn't roll until 6 months, didn't sit up til 8 months, didn't walk until 18 months. Doctor says he's completely fine just slower lol. Is it safe to say he will be much later with this too?? I'm scared he will never want to 

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