Welcome to the community!
To be honest, I've no idea why do you need to load all the in built packages every time you use R. But anyway, you can do something like this:
ip <- installed.packages(priority = c("base", "recommended"))[, "Package"]
sapply(X = ip, FUN = require, character.only = TRUE)
You can also use "high" in place of c("base", "recommended"). They are equivalent.
Hope this helps.