Summarize:

To act silly around your boyfriend, stop worrying about what he thinks. Commit to being yourself instead of trying to change your personality for him. If he doesn't appreciate your genuine personality, he's definitely not worth your time. Make a list of all your strengths, and read it daily to give yourself a confidence boost. When you're feeling unsure, stop for a moment and remember a time when you felt super confident. Try to recall the sights, sounds, and smells of that moment. Bringing yourself back to a moment of high confidence can help you feel more confident in the present. Listen to some confidence-boosting jams! You can even make a "confidence playlist" to psych yourself up. Part of being silly is being completely present. Instead of worrying about being funny or saying the right thing, focus on having a great time with your boyfriend. If you feel yourself starting to worry, focus on your breathing. Then, bring your attention to what you see, feel and hear around you. Notice your boyfriend's smile, the feeling of his hand in yours, and the sound of his laugh. If you feel the urge to do something silly, do it right away. After all, being silly is about letting go. The longer you wait, the more likely you are to hold back. Try channeling your goofy inner child who doesn't care what others think. If you're sitting by the lake, start a splashing war! Propose an impromptu game of hide-and-seek or tag. While there's definitely a time for seriousness, there's also a time to laugh and be goofy. Not every conversation with your boyfriend needs to be deep and emotional. Having silly, lighthearted interactions is important for a strong relationship, too. Don't take yourself too seriously, either. It's ok to act like a fool sometimes. In fact, it can actually be pretty fun!
Embrace your unique personality. Be present. Be more spontaneous. Don't take things too seriously.