As some others have said, I am pretty sure the first journal just meant that your article needs to be published at a more specialized journal. My first ever publication's story was like this: first, I submitted to a journal in a certain sub-field, then got feedback it was unsuitable for THEIR journal, but that it might work in a journal specialized in something else. I submitted it elsewhere (to one of the top journals in that other sub-field) and it got accepted after some small revisions.

As others have said: even established academics get rejections occasionally. Being asked to do minor or major revisions to an article is completely normal. I actually find the process of responding to peer reviews very helpful to my professional development, as it makes me think better about my research, and sometimes can really improve the quality of a paper. Occasionally, a peer reviewer will be egotistical, but generally I find them helpful.

You could volunteer to do peer reviews yourself (some journals ask for volunteers; others ask you to do peer reviews after you've submitted an article to them, even if it was rejected!) - it might help you see "the other view".

Good luck! And don't lose faith!