I'd bet you get the best results when you learn to relax, and stop carring so much about getting tagged.
Your body resonds faster when it is relaxed, and if you are worrying too much about getting hit you tend to tense up and overreact to things, which makes it very easy to set up hits.
Next start looking at angles, as a bit of a oversimplification you get hit when you stand in front of someone. If someone starts hitting at you, move so you aren't in front of them and you are harder to hit. This doesn't mean move back, then you are still in front of them, circle around them and counter.
And finally start setting your own stuff up. Keeping the same things in mind. To hit them you need them in front of you. For them to hit you you need to be in front of them. So when you step in with your jab, get off center for the follow up, keeping them in front of you, but angling out so you are not in front of them. Use your intial strike to force a reaction, which creates a opening. Hit the opening.
But keep in mind, the people that are better then you are supposed to be able to hit you more often. That's just the way it is. Relax, let that happen, and pay attention to what they are doing and what you are doing that lets them do it.