I tried to learn the trumpet when I was a kid, but it seems like I didn't have the sort of muscle control you need to play it well. I switched to piano after a few months. One tip I would like to share is that a trumpet player needs to understand a trumpet is a loud instrument by design. You can eventually learn to control the dynamics and play softer, but rehearsals are going to be loud, and the tone is going to be all over the place for a while.
My advice is to accept this as a fact and not worry about what other people are going to think. One of my problems was that I was afraid to commit to the playing of a trumpet. I was trying to keep the noise down, and that meant I wasn't playing the trumpet the way it was designed to be played. If you really want to improve your technique, find a rehearsal space that is either very soundproof or isolated and play strong notes.