It's wonderful to feel joy and happiness when witnessing happy relationships, regardless of their nature. The fact that you find happiness in seeing straight marriages/relationships suggests that you have a genuine appreciation for love and happiness in others' lives. This is a positive and empathetic response.
If seeing happy relationships brings you joy, there's no need to do anything specific. Embrace this positive emotion and allow it to uplift you. It's a beautiful trait to find joy in others' happiness, as it shows your capacity for empathy and connection with others.
However, it's essential to remember that not everyone's journey and happiness are the same. Some people may have different relationship preferences or orientations, and their happiness is equally valid. Being open-minded and supportive of diverse relationships can enhance your overall understanding and empathy towards others.
If you're genuinely happy for others, regardless of their relationship type, that's a sign of a kind and compassionate person. Continue to spread positivity, kindness, and support, and cherish the happiness that love brings into people's lives.