How do i tell him to not PDA ?

Basically, dont beat around the bush. but don't flat out say "I dont like you touching me" ya know? Just try to avoid him touching you as much as you can. When he asks why, thats when you tell him "I just think its awkward when you touch me so much in front of everybody. If you like me & want to date me, tell me. but could you stop touching me so much?" Make sure you get the point across. Good luck!