Since you have posted this on the Benalmadena forum I guess you are thinking about staying on the coast. I have no experience of staying on the Costa del Sol on my own as I prefer los pueblos blancos inland. My husband and I spend two weeks each year on the Costa de la Luz just south of Cádiz city, when he goes home to work I stay on but move inland. I am not actually on my own as I have our son with us, he has Down's Syndrome and is 23 years old.
I rent a house in the small town of Olvera which is a two hour drive from Málaga and we stay there for two weeks in the summer then a further two weeks in October. I have made nice friends in the town, some are ex-pat from various countries (it is a small ex-pat community) others are Spanish neighbours, people always stop to talk, ask you where you are from, etc. Over the last three years people have got used to seeing me/us around even if it is for only two weeks at a time and I now feel quite at home in Olvera. I can honestly say I have never felt under threat in any way. I can come and go as I please, I have a car and we dot about from here to there and back again exploring and this includes trips to Cádiz city and Sevilla. I have on occasion got myself lost and have had to ask my way when my SatNav has had me going around in circles. I speak a small amount of Spanish and can make myself understood (present tense only) although I often have difficulty with the answer as the locals speak so very fast.
Perhaps others can give you advice about being on the coast, I can honestly say that if my son did not want to stay on in Spain with me or was not with us for whatever reason I would still be happy to do what I currently do.