as'salaamu alaikum Amy,
A believer is always fear of his sins taking him or her to the hellfire. But hopelessness and despair is not allowed in Islam. For a believer also believes that Allah's mercy is greater than His wrath and He will enter us in Jannah through His infinite mercy.
You should focus on keep doing good deeds and trying to stay away from bad deeds. And if you sin then repent right away, for the Prophet

said one who repents is like one who didn't commit the sin. And continue have faith in the mercy of Allah and hop for the best as you move forward.
You can also maxmize your chances of getting there by doing certain things. Such as,
“He whosoever takes a path that leads to knowledge, Allah, the Almighty will pave his way to
Jannah.” (Muslim).
“He whosoever recites the verse (2:255) after every obligatory prayer will not be forbidden to enter
Jannah…” (Nasa’i).
So stick to your salah. Prophet (sas), “the key to Paradise is
Salah.”
Whoever prays the two cool prayers (Asr and Fajr) will enter Jannah. [Bukhari]
Be good to your parents.
“Paradise lies at the feet of your mother” (Nasa’i) or “A father’s pleasure is Allah’s pleasure, a father’s displeasure is Allah’s displeasure (Tirmidhi)
Be easy going.
“Allah, the Almighty let a man enter
Jannah because that man was easy when buying, easy when selling to others, easy when he passed a judgement and easy when he sought a judgement.” (Bukhari).
Be patient in times of tragedy.
“A believing slave servant of Mine will get his reward from Me upon the death of his beloved one, but such a person must show patience and perseverance for the fate of Allah, the Almighty, and if he does so, his reward will be
Jannah.” (Ahmed).
Be Chaste
Whoever can guarantee (the chastity of) what is between his two jaw-bones and what is between his two legs (i.e. his tongue and his private parts), I guarantee Jannah for him. [Bukhari]
Whoever says: “I am pleased with Allah as my Rabb, and with Islam as my Deen, and with Muhammad (sal Allahu alayhi wa sallam) as my Prophet, Jannah would be mandatory for him. [Abu Dawud]
Whosoever last words are: laa ilaaha il Allah, will enter Paradise. [Abu Dawud, Saheeh]
Whoever dies and is free from three: arrogance, grudges and debt will enter Jannah. [Tirmidhi]
Whoever raises two girls, he and I will enter Jannah. [Tirmidhi]
Whoever asks Allah for Jannah three times, Jannah will say: “O Allah, enter him into Jannah.” [Tirmidhi]
And there many others to help us get there inshallah.