Perhaps it's because your humour is possibly coming from a place of validation i.e. you come across as pining for their approval.
This is desperate, needy behavior which as others have already mentioned, women pick up almost instantly and are repulsed by naturally.
The key to good humour is that people laugh WITH you as opposed to AT you; could this be the cause?
This is possibly why girls initially laugh at you and then proceed to ignore/go back to their phones; you are coming across as nothing more than a jester for their amusement.
This can be fixed though, just be yourself and remember what the intention behind the joke is: Am I saying this because this is who I am/my personality or am I really just trying to impress those round me?
This is desperate, needy behavior which as others have already mentioned, women pick up almost instantly and are repulsed by naturally.
The key to good humour is that people laugh WITH you as opposed to AT you; could this be the cause?
This is possibly why girls initially laugh at you and then proceed to ignore/go back to their phones; you are coming across as nothing more than a jester for their amusement.
This can be fixed though, just be yourself and remember what the intention behind the joke is: Am I saying this because this is who I am/my personality or am I really just trying to impress those round me?