It doesn’t matter how much you can lift or what your physical strength is, brute strength doesn’t prove anything except that you’re a bully if you use this against others. Each person has their own strengths and weaknesses in personality and physical strength, what’s important is your determination to succeed.
You need to fight for what’s important to you, what you want to achieve in life. Don’t give up easily for things you value; if it’s important to you, it’s worth fighting for.
Mind over matter. No matter what you strive for, as long as you’ve got indomitable will, you will succeed.