Your story is a very cautionary. And it is a good example of some key things in finance, trading and cryptocurrency - learn in deep by your own the direction you are going to work in, do not trust another people the future of your assets and profit, and be ready that the technical analysis does not always works in predictions for crypto trading. Everyone should make decisions by his own, it will be the best choice.
No, this is not a case that will make learning with a mentor a bad thing. OP just got scammed by comment spammer that has a lot of bots to provide fake testimonies. I have seen this kind of scam in a Facebook group that I am in, a lot of bot accounts preaching the same testimony about trading. Of course there is nothing wrong with learning by yourself but being a lone wolf will only get you so far. Signal providers are a textbook case of trading scammers, no one knows what happens in the market, and if they say that they have an insider information about a rise, why would they give it to someone for a profit. If I know when the prices go up and down, I would not share it to anyone even for a profit.