Like I said, I get too scared and do nothing.
If you are that scared, I think you shouldn't trade yet. You're taking risk in trading, so you must have the courage.
I think I'm doing something wrong.
No one can tell you what's right or wrong, there's no certainty in trading. We have different targets, high for you might be low for me or vice versa. Your techniques might not work for me either.
Since you have price alerts, most likely you have a target price. If I were in your situation, once I reached it, I'd sell already. I don't know what will happen with the price after that, but I'll be at ease because I sold at my target price. If the price go down, then I have a chance to buy again, while if it goes higher, then I'll hold and wait for the price to go down if I want to buy again.
Don't trade if you're not ready.
Don't go all in at once.