It is more natural to make trouble singular.
The the two sentence do not have exactly same meaning although they are similar.
"I got into financial trouble" is nonspecific - it may not have been your fault.
"I got myself into financial trouble" - you are saying it was your fault.
2019년 10월 17일
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Well the second one is more natural. Actually, In
the fist example; “I got into financial troubles.” sounds awkward as a plural. It would be better to say; I got myself into financial trouble.