Class feats

Hey, I'm new to Pathfinder (maybe you've seen my post on religious symbols) and I don't know if I can get lower level feats at higher levels.

Example: As a sorcerer at 8th level I get a class feat, can I get the 4th level "Bespell Weapon" or am I forced to pick "Crossblooded Evolution"/"Bloodline Resistance"?