Yes it can be bad to push your pee out.
When you need to pee and you have a healthy bladder that is working properly you should never have to push your pee out.
Your pee should easily come out without needing to force it.
When you need to strain to pee or push your pee out the cause could be caused by problems with the contractile force of your bladder or problems with obstruction of the bladder outlet and urethra.
You should get checked out by a doctor because it's not ever normal to need to push your pee out.
Pee should easily flow from your penis or vagina when you're healthy and have no bladder issues.