#This is VERY overpowered

All of the features your race provides are among the strongest or at least medium level feats found among all races. (Potentially with a few exceptions.) This clearly makes your version of the Dragonborn race overpowered.

###Comparison with Variant Human Let's consider Horns and Gording Rush approximately worth a feat (Charger+Tavern Brawler). Both get +1 to 2 different attributes.

The remaining benenefits of Variant Human are the fact that they get proficiency in one skill and the fact that they have free choice of the feat.

Your Dragonborn gets

• +2 CHA
• Swimming speed/Underwater breathing
• Breath Weapon
• Gliding wings

This is much more powerful than Variant Human's benefits

###Comparison with Half-Elf

ASIs are the same

Half elves get

• Advantage on saves vs being charmed
• Darkvision
• 2 Skill proficiencies
• 1 language

Dragonborn

• Gliding wings
• Gorging Rush
• Horns
• Breath Weapon
• Swimming speed/Underwater breathing

The first 3 are at least as powerful as the remaining benefits of the Half-Elf, probably even stronger. Swimming speed/Underwater breathing is not a minor feature. Breath Weapon is also not a minor feature.

This is VERY overpowered

All of the features your race provides are among the strongest or at least medium level feats found among all races. (Potentially with a few exceptions.) This clearly makes your version of the Dragonborn race overpowered.

Comparison with Variant Human

Let's consider Horns and Gording Rush approximately worth a feat (Charger+Tavern Brawler). Both get +1 to 2 different attributes.

The remaining benenefits of Variant Human are the fact that they get proficiency in one skill and the fact that they have free choice of the feat.

Your Dragonborn gets

• +2 CHA
• Swimming speed/Underwater breathing
• Breath Weapon
• Gliding wings

This is much more powerful than Variant Human's benefits

Comparison with Half-Elf

ASIs are the same

Half elves get

• Advantage on saves vs being charmed
• Darkvision
• 2 Skill proficiencies
• 1 language

Dragonborn

• Gliding wings
• Gorging Rush
• Horns
• Breath Weapon
• Swimming speed/Underwater breathing

The first 3 are at least as powerful as the remaining benefits of the Half-Elf, probably even stronger. Swimming speed/Underwater breathing is not a minor feature. Breath Weapon is also not a minor feature.