Hello M.,
You have your hands full and I admire you for raising your kids yourself. I am the mother of two teenagers (girl 17, boy 15) and appreciate my husband's help, even though I must goad him for it sometimes.
Teenagers are a very special breed of humanity. They are neither a child nor an adult. It is a very frustrating time of life (for them and us). They will all test their boundries in an effort to be grown up, but still want to come home to familiar, safe surrondings... especially if they have screwed up or been just a plain ol' teenager (translation; irresponsible).
You asked about "tough love". I have learned that tough love means following through with the rewards and/or consequences you tell your child will be the result of their actions. This is MUCH easier said than done, and I always want to cave instead of stand my ground, but I don't. I am however, open to listening to grievences, ideas, suggestions, and concerns that are presented in a well thought out way. In the end, the adult (which is me) makes the final determination.
You should know that all of my education in raising teenagers began three years ago (at 51 years old) when my husband said to me one day, "I want to adopt." Long story short, we adopted a 14 year old girl from Russia. One month ago we brought home a 15 year old boy from Kazakhstan.
While we have had to, and are again, putting in the extra effort of helping our children to adapt to new EVERYTHING (language, food, school, and what it means to be part of a family), I find that both of my kids have the same thought processes I did as a teenager. Test, test, test. Test everything, test life, test authority, test truth, test boundries. They want to test things out and still know there is a safe haven if the test fails. The most difficult part is standing your ground to enforce the rules in your home. Children must learn there are rules to follow all through life.
You are obviously a good Mama. Your head and heart are where they should be. You are doing something on your own where you should have a partner for some support and to work together with. There should be a monument in our Nation's Capital to single parents. I understand that you are tired and would just like to come home one night to a peaceful, relaxing family evening.
Please don't give up, because you are a beautiful Mom.
L.