Don't even try to pull your foreskin in erect condition or don
t try to cut your frenulum
as it causes sever bleeding & it creats a medical emergency for stopping of bleeding.
Frenulum carries important vessels in it that will supply penile muscles.
Your arousal & erection is due to this blood supply only if you stop this supply how can you get erection.?
If you have a tight fore skin does not retract over glans
in normal condition then you require circumcision
In your case you retract it easily so circumcision is not require.