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1 Corinthians 14:4 says He who speaks in a tongue edifies himself...
Edifies is the Greek word oikodomeó which has several meanings. One meaning is to make bold/encourage.
Therefore, if you are fearful or timid, speaking in tongues will make you _________. (See also 2 Timothy 1:7)
14. Speaking in tongues will make you bold/full of courage.
BONUS:
2 Tim. 1:7 For God did not give us a spirit of timidity (of cowardice, of craven and cringing and fawning fear), but [He has given us a spirit] of power and of love and of calm and well-balanced mind and discipline and self-control.
15. Speaking in tongues will fill you with Power
16. Speaking in tongues will fill you with Love
17. Speaking in tongues will develop a calm, well-balanced mind and discipline and self-control
*When you speak in tongues, all that He is becomes available to you.