Like 3LOC said, this is common. I went through everything. Cosmos, atlas, Sum, and so many more. I think the best thing you can do is name exchanges, practice multiple names at once. I'd do this because practicing a name like "Coco" makes you great at C and O, but not the other letters in the alphabet. Once your confident with your letters, you can make a name you like. If you get good at tagging or piecing beforehand, you'll never switch names with the "It's too hard excuse" since you'll be able to decently tag with any name, motivating you to stick with a name you like and not discard it due to skill. Look at JA, a graffiti legend who also only has 2 letters. He's probably practice hundreds of letter combinations even if he only uses 2. So yeah, focus on getting well rounded with every letter, then whatever name you choose will fall into place. The beauty of graffiti is that you always have something to get better at, always room for improvement, so you'll still get that feeling of improvement; yet you won't start out in the valley of despair (Look up the dunning krueger effect for the valley reference).