Hello,

I'm trying to convert a gene (DNA) into a protein (amino acids)

I tried to convert them but I have a lot more amino acids than here for example https://alphafold.ebi.ac.uk/entry/Q8W3K0

This is what I tried https://web.expasy.org/translate/

I try to find a software where I just have to enter the sequence and I will have the result
If this is a known gene then you don't need to do this manually. e.g. https://www.ncbi.nlm.nih.gov/nuccore/NM_000207.3/ is human insulin. If you look at the record you will find a link for protein sequence `NP_000198.1` in that record. Or you could simply search for protein sequence directly using the name of the gene.