It’s great that you have become aware of this. It’s not something you can change over night, the next time you start to fall for someone maybe take baby steps to get to know them and feel secure. Once you feel secure, it may be easier for you to let your guard down, and on the flip side, they will understand you and understand that just because you dont always show it, you still love them. Communicating well may help you bond better with guys eg.: talking about their pasts, insecurities, loves, etc? There’s nothing wrong with playing it cool with a guy you like ;), but Slowly opening up with the right guy may be great!

Hope this helps xx