forever lp skipping

i recently bought a forever lp and i was playing older records on it like pink floyds dark side of the moon that i found in my basement and it worked great. but i went out and bought 5 new records in sealed plastic and everything and the record player skipped on all the new records. the control arm isnt adjustable on this record player so i put a penny on it and that seemed to stop the skipping. but i still dont know what the problem is. do i need a smaller needle for new records? or is this just an unfixable problem.
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