How do I get over stress, anxiety and the feeling of wanting to commit suicide?

First of all, don't worry, what you are going to is perfectly normal. It sounds like you are going through some heavy anxiety and possibly some depression, which makes sense since you are going through a period with a lot of changes and responsibility. I would recommend you talk with some form of a counselor or even just your doctor,

The one that is creating stress and anxiety, even the feeling of wanting to commit suicide is the mind. The mind is our biggest enemy, it's a rascal. We confuse the mind to be the intellect, the intellect is different, it helps us discriminate. It stops us from doing things that are wrong, even taking the extreme step of suicide. But the mind is a monkey, it thinks one thought every second, this can be up to fifty thousand thoughts a day. It is this overthinking mind that causes stress, anxiety. It causes fear, and worry. If we want to transcend the mind we have to make this monkey mind into a monk. We have to learn to spend time in silence, meditation. Unless we quieten the monkey mind, we will continue to live with anxiety. Therefore start practicing silence, slow down your pace, stop the monkey mind from jumping from thought to thought.