Changing between PVST and rapid-PVST doesn't change/impact portfast.
Changing interface portfast, whether done individually per port, or via global setting, impacts PVST or rapid-PVST operation. (How each is impacted is a bit different, as they don't work exactly alike. [In fact, if I remember correctly, portfast was a Cisco feature of PVST that was, more-or-less, incorporated into standard rapid STP's edge port feature, but Cisco continued to use "portfast" to enable rapid STP's edge port feature.])
As to BPDUguard, again, if you want to begin a discussion of other STP features, open a new discussion. I suggest this, because other readers would likely not expect such information based on your OP.
Also, if you're not real knowledgeable about STP, lots of material on the Internet, including on Cisco's main site, that would be more helpful for learning about STP and its options. These forums usually better address specific operational questions or issues. Cisco's learningnetwork.cisco.com is better aimed at generic learning of network technology.
Lastly, you've already marked one reply as the "solution" to your OP. Again, other readers might focus on that ignoring additional side information. So, also again, open a new discussion, and/or try one of the other venues I've suggested.
