Always lose money before I start winning during a session. Normal?

Hi all,
I play 100NL and in at least 90% of my sessions i drop a buy-in or two before I start winning. I wanted to ask if that happens to many of you and also to ask about some suggestions how to prevent it. I am quite aware of the 'problem' and I try to be particularly cautious at the beginning of a session, but, without noticing any glaring mistakes in my play, I still lose some money initially. The most logical explanation I can find is that I 'need' to lose some money before I motivate myself and bring my A game. However, even when I try to avoid it, I am unsuccessful... Any suggestions about what i should do?

Overall, I am a winning player at the 100NL level over a some months now (knock on wood :-))), so I don't think moving down in limits is necessary. I just want to fine-tune this one aspect of my play.

Thank you in advance for the suggestions.