As they say "pride goes before a fall." A preacher when you were 16? That is something, and probably far too much for anyone to cope with in their immature years.
Check out Peter who denied Christ three times. Denying Christ under temptation (i.e. being faithless) is somewhat different from disowning Christ.
2Ti 2:12.
Because of your youth it seems more than likely you were faithless, but have yet to disown Christ.
Tit 1:5 For this reason I left you in Crete, that you should set in order the things that are lacking, and appoint
elders in every city as I commanded you—
Word for elder:
G4245
πρεσβύτερος
presbuteros
pres-boo'-ter-os
Comparative of πρέσβυς presbus (elderly);
older; as noun,
a senior; specifically an Israelite Sanhedrist (also figuratively, member of the celestial council) or Christian “presbyter”: - elder (-est), old.
1Ti 3:1 This is a faithful saying: If a man desires the position of a bishop, he desires a good work.
1Ti 3:2 A bishop then must be blameless, the husband of one wife, temperate, sober-minded, of good behavior, hospitable, able to teach;
1Ti 3:3 not given to wine, not violent, not greedy for money, but gentle, not quarrelsome, not covetous;
1Ti 3:4 one who rules his own house well, having his children in submission with all reverence
1Ti 3:5 (for if a man does not know how to rule his own house, how will he take care of the church of God?);
1Ti 3:6
not a novice, lest being puffed up with pride he fall into the same condemnation as the devil.
word for novice:
G3504
νεόφυτος
neophutos
neh-of'-oo-tos
From G3501 and a derivative of G5453; newly planted, that is, (figuratively) a young convert (“neophyte”): - novice.