Don't give up. It gets easier. I promise. A lot of it is gaining they physical strength to get up. As you get stronger, it gets easier. I've walked up hills tons of times and still do. Even if your bike is on the heavy side, you'll get up there. One of my bikes is pretty heavy, but he gets up there eventually.

Don't "mash" the pedals. It's easy to start pedaling really hard with all your strength in desperation to get up faster only to bottom out a few yards later.

Use your lower gears. Even if the lowest gear isn't low enough, you'll get better as you go.

I've found that instead of walking, I stop and wait to catch my breath. Once I've stopped dying for oxygen, I can keep going a little further up the hill. Walking a bike just seems to make me feel even more irritable but if I have to, I do.

Relax. The harder you push on the handlebars or "mash" the pedals or tense up, you are using energy that can go to going up the hill. Even if you only going 2 miles an hour, you're still getting there.

Sometimes it helps to focus on a point up the hill, like a sign and keep going until you get there.

Hope that helps some. Just keep going and don't beat yourself up.