Take classes and see what you think.

Going to a therapist is not a weakness, it's actually recommended. EVERYONE has issues, and showing that you're working through them is a strength. But yes, you have to be well grounded to stay in the job. The clients you work with will be talking about stuff that really can trigger your own stuff, so you need the tools and support to manage that every day.

Having a big heart is good. But, you need a big heart with boundaries. To remember, that this IS a job, and that you have to have limits otherwise it's a one-way flight to immediate burn out. Self care is vital, and YOU have to be number ONE on your list.

It's also a lesson that you can't fix people. You can only give them the tools to fix themselves. I learned this the hard way. But, it's not your job to fix people, simply to guide them in the direction they wish to go. Kinda that "You can lead a horse to water, but you can't make him drink" rule. You give them all the skills, and what they do with them is their choice.

I dont think you can train yourself not to be affected. But you do learn how to separate yourself from you work, and leave things at the office.

Good luck to you.