single mom considering adoption for my two year old

First of all it is obvious you love your son and you say you want the best for him but the best for him is being with you. All you need to do is to get some help in straightening yourself out. You might give him up and you regret it and he resents you for it. Try to seek help, talk to a counsellor and seek people who can support you and do right by your son by being their for him, a good mother.