l like Laurence's answer very much, but I'm going to ask a question and then offer some additional alternatives-- not instead of his but in addition to them.
You didn't say which of the three types of minor scales you were using: natural, harmonic, or melodic. I'm going to offer three strategies, and you should pick the one that matches the type of minor you tend toward:
Natural: Try sharping ONLY the third note of the scale (counting from the bottom), Leave the rest of the scale unchanged. See how that affects the feel of the melody. If it's comfortable, go with it through the whole tune and pick chords that match. It won't quite be major but it might still sound 'happier' than what you've been doing, and it might eventually pull you into actual major.
Harmonic: First, get rid of the augmented second, either by sharping the sixth note of the scale or flatting the seventh one. See which of those feels more kin to your style. If you pick sharping the sixth tone, then you have shifted into Melodic minor, so skip to that paragraph below. If you pick flatting the seventh, you are now in Natural, so skip to that paragraph above.
Melodic: Try using the same scale going up as you are using going down (Melodic Minor scales are different whether the tune is ascending or descending.) See how that feels. if you like it, start sharping the third tone of the scale. Voila! You're now in the enharmonic major and have solved your problem. If you don't care for the effect, no harm done and you can try one of Laurence's suggestions.
Hope that helps.