No, Rev. Stoffregen, not just "someone sent by God with a message". Read it again. This time without trying to force it to fit into your personally preferred and/or made-up definitions. Maybe try reading the words of this same Paul in 1 Corinthians 12, where he clearly distinguishes the office of apostle from all sorts of other offices in the Church (offices whose holders would also be sent by God with a message but who are NOT apostles).
Below are the definitions for ἀπόστολος from three Greek-English Lexicons. They are not my made up definitions.
from Lowe & Nida
1. one who fulfills the role of being a special messenger (generally restricted to the immediate followers of Jesus Christ, but also extended, as in the case of Paul, to other early Christians active in proclaiming the message of the gospel) –
apostle, special messenger2. (derivative of ἀποστέλλω to send a message) one who is sent with a message –
messengerfrom Bauer Danker Arndt Gingrich
1. of messengers without extraordinary status
delegate, envoy, messenger2. of messengers with extraordinary status, esp. of God's messenger, envoy
Liddell & Scott
1.
a messenger, ambassador2.
an apostleThere are two uses in scriptures as these two definitions indicate: a specific one and a general one. Under the general one, all of us who have been commissioned to go with a message are apostles.