For the OP, it might be wise to not go "hardcore" punk straight up. Try easing into it, as was suggested a little earlier in the thread
Bands like Millencolin, Pennywise, Blink 182* (but avoid Enema of the State, far too poppy) Frenzal Rhomb, Unwritten Law and maybe some Greaves era Misfits (which i am loving at the moment)
Then you could also look at some of the greats like Ramones, Dead Kennedys, the Clash etc
*more pop punk, but Enema is the worst
Bands like Millencolin, Pennywise, Blink 182* (but avoid Enema of the State, far too poppy) Frenzal Rhomb, Unwritten Law and maybe some Greaves era Misfits (which i am loving at the moment)
Then you could also look at some of the greats like Ramones, Dead Kennedys, the Clash etc
*more pop punk, but Enema is the worst