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Irregular periods could be due to hormonal imbalance and it is quite common during teenage.Regarding the bloating it can be due to excess gas formation which is the most common cause and the best way to control this symptom would be lifestyle changes:
Have small frequent meals in a day and avoid spicy foods, fats and fried foods.Drink lots of water and prefer having fruits,veggis,salads etc.
Regarding the vaginal odour the most common cause is fungal infection.The preferred treatment for it is an antifungal cream such as Cotrimazole.You can consider visiting a Gynaecologist for complete clinical examination and hormonal analysis.If required you might be prescribed medications for the same.
Take care!