Hello, do I need to keep losing weight or?

Don't be intimated by the gym, most people who lift are there for themselves and are not focused on you. Gym membership usually cost about the same as a reasonably priced latte (a day), would you give up one coffee a day to feel better about your self? I know I would and did.

If your equipment is an issue consider body-weight training.

Convict conditioning,You Are Your Own Gym etc time to ramp up the resistance training, develop and maintain that sweet LBM or muscles.

I think you most probably have the blues because you are at or close to your goal weight and don't see what you expected to see, and with all the weight loss and cardio you have most probably lost a fair amount of LBM.

Good luck OP

^^^ This.

I think you feel the need to lose more weight because you're still not happy with your appearance, even after coming so far, but as you said, some of it is just the result of the loss, loose skin, stretch marks, as you noted. Some, or possibly even all, of this will go away with time and continued work. I think you're feeling unmotivated because you know you don't really need to lose more weight, but you're not sure what to do next. Beginning weight training is intimidating for a lot of people. Listen to your doctor, as it seems you're at a healthy weight, but find something that you can do that you can enjoy.

If you feel uncomfortable working out at the gym, invest in a set of weights for home, even if you just start out with a set of dumbbells of varying weights, a kettlebell, or resistance bands. You can probably purchase used weights to start. Check craigslist or some other local posting for someone selling their equipment. Even a few basic pieces could get you on your way and would probably be comparable to what you'd spend in a year at a gym.

The tip about bodyweight exercises is especially good. It would be an easy way to break into some strength training without going out of your way or spending a lot of money. You Are Your Own Gym, either the book or the app can help you with this, and also, you can find demonstrations of bodyweight exercises and various lifts using barbells/dumbbells/other equipment here by muscle group: http://www.exrx.net/Lists/Directory.html. Also, it wouldn't take a lot of time each day to start incorporating this. 20-30 minutes to start building some muscle and confidence.

There is a plethora of information on the internet to break you into strength training. Do some research. There are tons of videos to show you proper form and sites that offer beginner routines to teach you how to start incorporating it without the use of a trainer. Though, if you are especially uncomfortable, it might not be a bad idea to work with one for a few sessions to learn some basic lifts and work on your form.

http://www.myfitnesspal.com/topics/show/850719-strength-training-the-basics
http://www.myfitnesspal.com/topics/show/902569-barbell-routines-when-you-only-have-dumbbells
http://startingstrength.wikia.com/wiki/FAQ:The_Lifts
http://www.myfitnesspal.com/topics/show/852401-proper-form-and-technique-sources
http://www.myfitnesspal.com/topics/show/864338-f-cking-strength-training-101
http://www.nerdfitness.com/blog/2009/12/09/beginner-body-weight-workout-burn-fat-build-muscle/
http://www.bodybuilding.com/exercises/finder/lookup/filter/equipment/id/1/equipment/dumbbell
http://www.myfitnesspal.com/topics/show/833026-important-posts-to-read