Word Embeddings : DOc2Vec Why it fails? ( twitter Sentiment Analysis)

Why does Doc2Vec performing extremenly poor while training ??
In Twitter Sentiment Analysis ( practice hackathon).
Like, It is giving extremely low F1- score in all different models. Why is it so??
Doc2Vec gives additional feature vector as Document feature vector…
But, Still, it has failed. I am curious to know the reason bcause it failed for all models…???

@AishwaryaSingh I hope you can answer this!