not very affectionate 😔

Hi ladies, I'm 24 years old, been with my fiancée almost 3 years and have a beautiful 3 month old. We have our ups and downs like any couple but we love the Bones of each other....there's one problem in our relations however, I pretty much hate affection...
Hates probably too strong of a word but it doesn't come naturally to me and it certainly isn't on my radar. 
It makes my partner so sad (they say they 100% know I love them but would like to be cuddled etc) but I just don't think to be that way, it doesn't come naturally as I'm not too fond of it, it makes me feel awkward, and I find that if I make a special effort to be affectionate it means my partner is 1000times more affectionate which makes me pull away again. My grandads wife (not my grandmother) says my entire family is like it from what she has seen, she says it's always our partners who she has noticed give the attention and my family are always on the receiving end looking awkward. I want to be affectionate and to enjoy it but I don't know how 😩 I know i am so so lucky to have such an adoring partner and I want to be the same for them. is anyone else like this? Any advice? Thank you so much x