Criticizing one another will only lead to further unhappiness. Love and accept each other as you are and your relationship will magically transform.
If you do not love your partner enough to accept them as they are then it is time to think about moving on. We can not change anyone if you entered into a relationship with the belief that you can change the person you are in for a rude awakening. Permanent change only occurs if the person desires to change. Insisting that someone changes to remain in a relationship makes for a very tense situation and if they do not genuinely wish to change it can add trust issues to an already unpleasant situation.

Don’t make decisions based on guilt or what you think you should do, for it is only in being true to yourself that you can be true to others.

If there is something happening in your relationship that you do not like speak with your partner about it now. The longer you wait the harder it will be to deal with. If you wait and bring it up when you are angry or unsettled it will be looked at as if you are only speaking about it because you are angry. When you first notice an issue that is unsettling that is when you address it.