Never give up, and be confident in what you do. There may be tough times, but the difficulties which you face will make you more determined to achieve your objectives and to win against all the odds.
The battle of life is, in most cases, fought uphill; and to win it without a struggle were perhaps to win it without honor. If there were no difficulties there would be no success; if there were nothing to struggle for, there would be nothing to be achieved.
Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.
To write what is worth publishing, to find honest people to publish it, and get sensible people to read it, are the three great difficulties in being an author.
Michael and I had great role models. Though his father has passed away, his parents had an amazingly strong marriage, as do mine. Both weathered really tough times. For us it has been normal to stay together through difficulties. We grew up witnessing that firsthand.