Sure.
Paul could only teach what Jesus had already taught the Apostles and what the Apostles taught Paul and what he gleaned from the Holy Spirit working in him to write such important books as Romans.
As you've stated, Romans 9, 10 and 11 is about corporate sanctification and should not be used to prove anything personal...many will use verses such as Romans 9:15 to show that God chooses us and not the other way around (Calvinism teaches this). This should really not be done because Paul is speaking here about the nation of Israel being chosen by God, and not each one of us individually. God chose the Hebrews through which to reveal Himself.
However Paul did include also some very personal verses: For example Romans 10:9 .. if we confess with our mouth Jesus as Lord and believe with our heart, it will result in righteousness. So we have to distinguish which verses are personal and which are corporate and this is not always done.
Also, getting back to Paul - he could only teach what Jesus taught. Jesus taught that HE is the vine through which we get our life. If we are cut off from this vine, we wither and die. This is found in John 15:1-6; specifically 5 and 6. IF ANYONE does NOT ABIDE IN HIM, he (personal) is thrown away as a branch, and dries up, and the dry branches are gathered and cast into the fire and they are burned.
This is the same language used in Romans 11:19-23
11:19 Branches were broken off to make room for the Gentiles (corporate)
11:20 They were broken off for unbelief, but YOU stand by your faith, do not be conceited but fear ('personal)
11:21 If God did not spare the natural branches neither did He spare you. (corporate and personal- because it refers back to what Jesus said in John 15)
11:22 God can be kind or severe: Severe to those who fell (can a nation go to hell? This is personal)
Kindness to us IF WE CONTINUE or else we also will be cut-off. (this sounds very personal to me since a nation, as a whole, will not go to heaven).
This seems clear enough...you may disagree.