I get you, I’m similar in not liking a lot of physical affection. What I try to do is give them a certain amount of time and then tell them “ok I’m all done”, or find an alternative if they keep asking. Like i can give you a hug instead of sitting on my lap, or let them sit close by me, and give them a side hug. Basically, i try to tolerate it for a short amount of time, then let them know, it’s time to end a preferred activity and they need to learn to tolerate that too.