Dreamer, you did say 'drawing' so I presumed that graphite was the main medium you were using. My mistake. Its good that you are trying other mediums.
My term of 'restriction' was in relation to you drawing celebrities only which is what you stated in your original post. And that can have its own set of problems in terms of copyright, unless you have permission to draw the image and show it on a public site. Its fine if you're just drawing them for your own personal use and for practice. Perhaps you need to ask yourself why you only draw celebrities. What is it about them that sparks enough interest that you want to draw them? Why not the person next door or your boyfriend? We all have different subjects that appeal to us most and that we concentrate on, perhaps it is portraits for you. If so, you need to incorporate more variety of faces into your work.
Years ago, I took my portfolio to an art school. It was filled with portraits and life drawings, my passion at the time. It was rejected because it wasn't broad enough. I went back to the studio and did landscapes and buildings and animals as well as portraits and life drawings and reapplied. It was accepted. They wanted to see the range of drawing and painting and subject matter than I could tackle, not just one subject. By letting yourself fall back into your comfort zone constantly, you won't reach your next level of expertise or learn what you are truly capable of.
Money issues? Ok, then tackle some free online class resources to learn new skills. There are drawing challenges here weekly and on other sites. Try the portrait challenge monthly at WetCanvas, do self portraits. Try new subject matter. You don't need expensive equipment. You can get a decent drawing pad and pencils at the dollar store. Or buy some copy paper. Use recycled paper from offices. Making a goal is also useful. You need to know where you're going to be able to know if you've gotten there or not. What is your goal? Do you know it yet?
It isn't my intention to back you into a corner or make you feel threatened. You put your problem on the table and asked for advice and based on what information you provided I gave my two cents worth. I think we all like to stay in our comfort zones and not have parts of us exposed to the world. The world of art is visual and with that comes scrutiny from ourselves and our peers as well as the rest of the world. A lot of that is good when it is praise. The critiques aren't always so easy to take, but if done constructively, they are essential to help us move forward.
All artists have confidence issues, no matter what their level of experience. We all have doubts and fears. We also all start projects and lose interest in them too. Don't beat yourself up over it. Try something each week or month that you wouldn't usually draw or paint. For me its flowers. I DESPISE drawing or painting flowers. I can do it, but I sure do dislike them. But I make myself do it now and then for a couple of reasons. One, to push myself out of that comfortable space and two, to prove to myself that I can do it.
Finally, going out in public to draw. Well in all the years that I've done so, perhaps two people have come up to me and asked to see what I was doing and were interested and pleasant. In all honesty, people don't care what you're doing as long as you're not bugging them.

Good luck with it.