Large supermarkets frighten me however, I overcome my fear because I can find
everything in one place.
F.
NO CHANGE
Large supermarkets frighten me, however I overcome my fear; because
H.
Large supermarkets frighten me; however I overcome my fear because
J.
Large supermarkets frighten me; however, I overcome my fear because

J

Explanation:

The proper way to punctuate the use of a conjunctive adverb (however) when connecting two independent clauses is as shown in "J."

The only other way is to use a period (instead of a semicolon) and use a capital "H"" for however.

frighten me. However, ...

the writer needs to avoid using abbreviations and check spelling before sharing.